How to Clean / Change MAF Sensor on Trafic, Vivaro & Primastar Vans

Hello, this is a guide on how to change or clean the MAF (Mass Air Flow) sensor on Opel / Vauxhall Vivaro, Renault Trafic and Nissan Primastar Vans.

If you have a Vivaro, Primastar or Trafic van and have no power at low revs, general rough running and have the check engine light illuminated on the dashboard, there are several things that you need to rule out to track down and solve the problem. Changing or cleaning the MAF sensor can often solve your running problems, so read this guide to find out how to do it.

These vans are all the same van, made at the same factory with a different badge on the front, so this guide applies to all three.

Before buying a new MAF sensor, then cleaning it to see if that helps is always worth a go and will cost you very little, just a few minutes and a can of electrical contact cleaner. If cleaning it doesn't help, then changing it could be the next step, but go for the cheaper option first!

So what exactly does the MAF sensor do?

The MAF sensor basically measures the amount of air that is going into the engine. It then feeds this information to the ECU, which decides how much fuel it's going to then deliver to the engine. As engines run on fuel mixed with air, you can see that if the MAF is faulty or dirty and giving an incorrect reading, it can have a pretty major effect on how the engine runs. The most common complaint with these vans seems to be that they sometimes are low on power, especially below 2500rpm and sometimes won't rev properly. The best thing to do is connect your vehicle to a diagnostics machine and get the codes, if the code returns back with a MAF fault, then clean it or change it.

Some people go through a trial and error method of replacing bits and hoping it solves the problem. I can't recommend doing this, but if you are going to, then the MAF is a good starting point as it's cheap, easy to replace and is often the cause of a lot of problems.

As you can see from the photo below, my van is a Renault Trafic. Like I said, the Opel / Vauxhall Vivaro and the Nissan Primastar are essentially the same van, so apart from the sticker, once you've removed the engine cover that sits on the top of the engine, you should be looking at this view below, which is the airbox and the MAF sensor visible towards the back of the engine bay.

How does the MAF sensor get dirty enough to need cleaning?

The MAF sensor is in the flow of the intake air. It is situated behind the air filter, which will clean the air to some degree, but there are still many thousands of litres of air flow past this sensor and over time it will get dirty. The MAF sensor being clean and working efficiently is vital for correct running.

Here is a close up view of the sensor

Here is a closer view of the MAF sensor. The design of the engines on these vans is slightly different over the years, as there are several engines including the 1.9, the 2.0 and the 2.5.

On all of these, the MAF sensor is in line with the pipe that feeds the air into the engine (it has to be as it is measuring the air going in after all!) so it isn't too tough to find. On this picture here, which is the 1.9 dci engine, you can see it just above the airbox.

To access the sensor, then the first thing to do is to undo the connector.

Remove the connector first

Pop this jubilee clip off

Pull off this pipe

After you've removed the pipe, then remove both airbox bolts. There's one on the right and one on the left, I've taken a photo of the one on the right, I couldn't easily get the camera to the one on the left as it's a bit obscured, but it's not tough to find. After you've undone both bolts, a bit of jiggling will see the airbox come out completely.

This is one of the airbox bolts

Once removed from the van, this is what you will have sitting on your drive!

This is the MAF sensor, still screwed to the airbox

The MAF sensor unscrews from the airbox with a torx 30 bit. There are only two screws holding it in, which you can see in the photo below.

If you're going to have a go at cleaning the wires inside, remove the MAF from the airbox, then just spray them with electrical contact cleaner and just make sure you don't touch them as they're delicate. If you're just replacing the unit, then undo the two screws, attach the new MAF to the airbox and refit.

The inside of the MAF sensor

Well I hope this article helped. If the MAF was the problem, then once you've plugged the new / cleaned MAF sensor in you'll be able to feel the difference straightaway. Make sure that when you spray the MAF sensor you use electrical contact cleaner, not carb cleaner or WD40. Contact cleaner, which can be labelled as such, or cans that are labelled up as MAF sensor cleaner (basically the same thing) doesn't leave any residue.

There are other things that can go wrong with these vans that can affect the running, but as the MAF is a pretty easy fix that often solves a lot of problems, then it's a good starting point.

I have also written another article on cleaning or blanking off your exhaust gas recirculation valve (EGR valve). That is another common cause of rough running so can be beneficial if you're having problems, or if you want to prevent them. If you scroll down, then you should find the link to that article below.

Good luck working on your van and if you have any comments, please leave them below.


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Comments 135 comments

Adam 4 years ago

Hi cheers for this. My trafic is playing up. Keep chugging and wants to stall and worst when doing low revs. Egr cleaned and sorted. I disconnected the maf and started her up and the van was terrible and hardly revving . So does this mean my maf is ok ? Cuz the chugging makes me think maf... Hmmm storage. Glad of some device. Been told turbo could cause chugging but surely the turbo don't kick in till about 300rpm? Cheers

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Rain Defence 4 years ago from UK Author

I can't say for sure what your problem is, there are a few things that cause rough running with these vans. But in your situation I'd put a new maf in. Let us know if you do decide to do that if it sorts it.

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dommcg 4 years ago

Good article, do the same rules apply to cars?

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Rain Defence 4 years ago from UK Author

Yes, if you have a diesel car then you should keep an eye on the MAF sensor as they can clog up on cars just as easily as vans. It's not tough to clean them and should be part of your normal maintenance schedule, or just something for you to do as a treat at the weekend..:)

Wiggyjnr 3 years ago

Hi, just cleaned mine as the part to replace is £100! (2.0 dti vivaro, 57)

This was what the diagnostics machine told me was at fault. Do I need to reset the ECU to get rid of the lights on the dash? Thanks!

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Rain Defence 3 years ago from UK Author

Yes, it shouldn't cost you much to do this though. I hope your van works properly now!

ed 3 years ago

good stuff fella .

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Rain Defence 3 years ago from UK Author


winston 3 years ago

my nissan starts but wont rev up when it is hot

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Rain Defence 3 years ago from UK Author

What have you tried?

Popcop 3 years ago

Thanks for good info, waiting for good weather to check out EGR and Maf on my Traffic 2.5 which both should be same but in different places to 1.9, thanks again.

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Rain Defence 3 years ago from UK Author

Thanks, these guides should help somewhat even though the engine is a bit different.

paul h 3 years ago

in reply to winston.with your only happening when hot id have said its probley the turbo boost solenoide valve.easy way of checking if your maf sensor if broke is by disconnecting it.pre heat light will come on but might take bit longer start first thing but should rev up ok.if this is what happens to yours then the maf sensor has had it.if still the same and wont rev nnext step id check the egr valve as it wont cost out.through a lot of grieve ive had with these van i recommend doing the free checks first then if no joy get it on a diagnostic machine.for £40.00 it could save you a lot more than just trying various parts

mark 3 years ago

an excellent article easy to follow & well written,thanks.

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Rain Defence 3 years ago from UK Author

Thanks for your comment

colin 3 years ago

Both MAF and EGR articles seem very thorough and informative. I know what i am doing tomorrow now, as i have been plagued by problems of this nature on my DCI100 van for some time. Thank you for great articles I will let you know how I get on.

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Rain Defence 3 years ago from UK Author

Thanks for your comment, keep us updated!

mark 3 years ago

hi, good advice i've read. Question, where do i find the engine temp sensor that shows on dashboard. Mine must be loose as the digital display looks more like a graphic equalizer going up and down .

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Rain Defence 3 years ago from UK Author

Hi, the sensor is on the right hand side of the engine. Remove the main air inlet pipe (big one at the top) remove the 2 heater pipes (the ones with four wires connected) remove vacuum pipe located at the front of engine and if you look under the thermostat housing there it is with a square connector. Theres a clip around it, pull the clip off and gently wiggle the sensor loose. It has an O ring inside to seal it. I hope that helps.

mark 3 years ago

Hello again. Right regards maf sensor as not got round to engine temp, done as shown,put back together , starts up and then stalls after about 10 secs. Was running before albeit didn't get revs for first ten secs but then revved up ok. Think a bit of wd40 may have found its way towards insides of sensor , would that affect it?

Mark 3 years ago

Hi, you seem to be the only person in the british isles that knows what hes doing with these vans!! i hope you can help me with mine. when cold my van does not start at all. i had the greenflag boys out and they diagnosed faulty glow plugs. i changed these but to no avail. the next day the same thing happened. i removed the outgoing fuel pipe from the filter to see if there was fuel getting through and there was so i called out greenflag again. this time he said it was air in the fuel lines. this is confusing as it wouldn't start before i took the line off. if i start the van from hot it starts albeit reluctantly but if left for four hours or more to get cold it just wont satart again. this weather compounds the issue. do you have any ideas?

slb3101 3 years ago

Hi there, Your knowledge is second to none, well done!!...I was wondering if you can help me on my problem. I have a 05 vivaro cdti with 120miles, the problem is that for a while when i accelerated for a long period(i.e on motorway)it would just lose all power,to 2000 revs and as i was still moving i would turn the ignition off and back on and that would kick it back into having some power. The problem i have now it lost power the other day, and now it will not start at all...any help on this would be hugely appreciated.

dave 3 years ago

thank you very much just gone self employed sparky brought a vivaro quickly had a few probs but running was main thing did as you said and all good now cleaned first ran better left it unpluged ran like brand new thank you again

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Rain Defence 3 years ago from UK Author

Thanks, glad it helped

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dmvjane 3 years ago from Philippines

Very informative hub. *Bookmarked* I could use this in the future! Kudos!

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sany72 3 years ago from Romania

good post

noel 3 years ago

hi, i have a problem with my nissan primastar , when i change gear, instead of the revs coming down they go up, sometimes it works fine but most of the time this happens, it seems to rev up more when changing from 1st to second gear, could this have something to do with the maf censor, your reply would be much appreciated ,



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Rain Defence 3 years ago from UK Author

Sounds to me like your clutch is on the way out.

Popcop 3 years ago

Took lots off to get at difficult access EGR valve (2.5), rain stopped play, put all back together. Drove later and engine going very good and turbo coming in at 1700 instead of 2300 rpm previously ????. Found later that I had not reconnected MAF connector, so I have left it off, no warning lights, just much better fuel economy and performance. Will renew MAF soon. So, to anyone who has trouble with similar, try unplugging connector 1st before trying anything else.

jadehierro 3 years ago

from Monterrey, Mexico, thanks, very clear and very clean advice, my baby 2008 traffic now wake up, more happy and power, more full, simple things to big problems, mi engine is 1.9 dci (with turbo?) they said no turbo, but I see one in it, thanks again.

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Rain Defence 3 years ago from UK Author

You're welcome, glad you found it helpful.

tony price 3 years ago

Wow, thanks. My van was hardly running, just took a chance and cleaned the MAF, van now running perfect. Thanks.

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Rain Defence 3 years ago from UK Author

Brilliant news, glad to help!

Damian46 3 years ago

Good articles. Just changed MAF and EGR. van started and did test run, slow to rev up to 2K rpm, reved to 4K to see if it would clean out any problem. Turned off engine and wont re-start. AA have run diagnostics and see no problem so they thing it's injectors or crank sensor. They say crank sensor wont show on diagnostics, very vague and find it hard to believe. Have disconnected the battery and re-connected to re-set ECU, also fuel going to injector. Any thoughts, Crank sensor?. is it an easy job, can't find anything on it online.

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Rain Defence 3 years ago from UK Author

Crank sensor is a common problem with these apparently. Never replaced one so have no idea exactly how hard, but it has to be a much easier and cheaper job that injectors so definitely the first one to try.

Damian46 3 years ago

Thanks. Do any other readers have any tips on replacing the Crank Sensor?. I can't find any info anywhere on!!!!

Damian46 3 years ago

Problem solved. The crank sensor had become slightly dislodged, so a quick clean and re-fit and problem solved. Probably the original issue all along, anyway no need to touch the MAF or EGR for a good while no. Thanks again.

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Rain Defence 3 years ago from UK Author

Good news that you've sorted it, even if maybe you didn't need to do anything to the maf or egr, at least you know they're clean now!

dean 3 years ago

Hi there Renault traffic sport that running rough after 2,500 rpm slight juddering sometimes, no dashboard light just feels sluggish, noticed that when hot, stood still will not rev above 2800 rpm, like engine thinks its cold??? Believe van has a cold function that stops it reving above 2800 rpm when cold, suspect this is fault with running when warm, runs better whilst cold at minute.

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Rain Defence 3 years ago from UK Author

Have you done anything with the maf yet? It's often the cause of rough running.

Saying that it runs better cold than warm makes me think egr as well/instead though as that is supposed to close when the engine warms, but if its clogged it won't. I'd clean both if I were and probably change air and fuel filters too if you haven't as if they're clogged it won't help matters.

Dean 3 years ago

Thanks for reply, is there any reason on idle why it won't rev above 2800 rpm, MOT coming up and won't be able to do emmisions test, got 2 x vans and 2nd one revs above on stand still so I think this is what's linked to the fault. Just cleaned MAF and EGR and although does run a little better still not revving above 2800 on stand still. When driving then dipping clutch revs ok???

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Rain Defence 3 years ago from UK Author

Have you tried unplugging the maf and seeing how it runs? If its knackered cleaning won't help. You don't want to run it like that long term but unplug it and see how it goes.

andy 3 years ago

i got a 53 plate vivaro 1.9 i had same probs with the revs under 2500 so i unplugged maf sensor and problem solved and no lights on dash either... happy days and thanks for your help.

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Rain Defence 3 years ago from UK Author

Glad to hear it, might be worth replacing it with a decent one though.

Damian46 3 years ago

In the past with diesel cars it was recommended to add a gallon of petrol to a tank fill of diesel, not at every fill but every 3rd or 4th. Is this still a safe practice as it helps to keep injectors and the and combustion chambers clean. Would be nice to get hear from the forum. Thanks

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Rain Defence 3 years ago from UK Author

Conflicting opinions on this one, some think its fine, others think you're running the risk of shafting the pump. Personally I probably wouldn't bother and I'd just run some injector cleaner through it if you feel the need.

Damian46 3 years ago

OK, thanks. I did do this for several years on a car without any problems, maybe I was just lucky. Cheers

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Rain Defence 3 years ago from UK Author

I'll remember that if I ever accidentally top up with petrol (or more likely if the wife ever does it!).

Donal o Keeffe 3 years ago

Thank you . Spot on my 2005 Opel vivaro 1.9 van was running very bad with the past two weeks and I took out the air flow sensor and gave it a bit of a clean and it goin fine now. Must get electrical cleaner on Saturday and take it out and give it a proper clean throughout . Great site . I priced two different places and there was 100euro plus the vat in the difference of the prices for the same part.

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Rain Defence 3 years ago from UK Author

I'm glad it worked for you. Thanks for your comment.

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Lars Ole Gudevang 2 years ago

I had my Traffic 2,5 tdi now for 7 years, running bad under 2000 and turbo kicks inn late. I have asked loots of mechanics in Norway, they have checked the car and change parts.. Nothing helped. Today I unplugged the MAf connector I it runs as new! Lot better under 2000 and turbo kicks in earlier and smother. I tried to clean the MAF as described and connected it again, but then it runs like it has the last years.. Is this proof enough that the MAf is damage and that it is the MAf causing the problem or can it still be the EGR valve? Sorry the english and thanks for the article!!!

keith 2 years ago

very very helpful and thank you

graham 2 years ago

well done i cleaned the egr valve it was completely metal put it back still the same thought as it was so bad this must be the problem then as you said i took the maf and spray cleaned it still running max 3500 rpm so i disconnected the maf plug and bingo runs great.... think it could do with a new maf but at least it runs well again thanks wayne

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Rain Defence 2 years ago from UK Author

Glad it helped out, all the best

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Rain Defence 2 years ago from UK Author

Doesn't prove it conclusively but in your position I'd buy one and fit it.

Mikey 2 years ago

Hi, excellent advice.

My problem is the same as Marks. Have an 09 vivaro that won't start on cold mornings, could it be fuel temp sensor?

Thanks in advance.

Graham Stacey 2 years ago

I have a vivaro which always starts and runs fine but when it rains really heavy it will initially start ok but then as soon as you rev the engine it will misfire and seems to drop onto 3 cylinders with billows of white smoke coming from the exhaust which illuminates the engine fault light. I have cleaned the EGR and had a new MAF fitted but the fault still remains. This only happens when it has rained really hard - is water getting into the engine somehow - any advice would be much appreciated

Andre Vitel 2 years ago

Hi, I have had some electrical problems with my Interstar. I have lights on the dash telling me to stop, service & the abs light is on. The power drops going up hills, to 2k revs, but can be reset by re-starting the van. I had a diagnostic done, & it didn't show any problems. The other things that are also related, is my speedo is not working, neither is my cruise control. This all happened at the same time. I will look at what you have illustrated above, on my van, & advise if it works. I have a suspicion though, that it might be the abs sensors. If so, have you changed out any of these?

Many thanks.

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Rain Defence 2 years ago from UK Author

I haven't changed the abs sensors. If you do replace them, let me know what sort of a job it was. Cheers.

wacko 2 years ago

thank you have saved me £`sss vivaro 1.9di glow plug light coming on when going up hills or on motorway at speed then going into limp mode

turning engine off & back on was resetting it then ran ok for maybe 5 ,10, 15 mins then light appears on again. just done all you said MAF & EGR cleaned out, now running as smooth as a babbys ass

great post thanks / wack

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Rain Defence 2 years ago from UK Author

Great stuff, thanks for your message.

tarboyo 2 years ago

Replaced maf today van run ok before, now will not start do i need to any ideas please.

JACK 2 years ago

HI THERE have a o3 nissan primaster van its turning off some time when driving its seem to be ok when its more than half full of diesel would the diesel pump be goin

woody451 2 years ago

Brilliant article. Not sure if these parts can cause my problem. 05 primastar 1.9 stood for few days with heavy rain. Went to start it, fired up , wont rev then cut out, wont turn over very well. Connected jump leads from car to van, van turned over and fired up but wont rev at all. Starts each time but still wont rev

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Rain Defence 2 years ago from UK Author

You tried disconnecting the maf and seeing what happens?

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Rain Defence 2 years ago from UK Author

Can't say for sure, but it sounds likely. Sounds like the tank is full of crap swilling around in there. Might be worth checking it out.

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Rain Defence 2 years ago from UK Author

Sounds like it could be broken. What does it do when you try to start it with maf unplugged?

woody451 2 years ago

Further to my van problem. Diagnostic unit set to nissan did not show fault but when set to renault faults were recorded on pedal track 2. So garage fitted new pedal pot and now accerates.

Keep up this brill hub.

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Rain Defence 2 years ago from UK Author

Excellent news, thanks for update!

Wayne 2 years ago

Hi Have a 2010 1.9 Traffic, Was running really bad difficult to pull off then yesterday spanner light came on and said check injection 10 minutes later engine management light on and shows as check emissions ... But now these lights are on van is running better on start and not sluggish?? Any help to this would be gratefully accepted. Thanks

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Rain Defence 2 years ago from UK Author

These vans have very sensitive sensors. Sometimes they're on and there isn't an issue. Only way to know is get the codes read at a garage and see what they say. My mates been running one for about 6 years now with the check engine spanner lit up with no issues so it's not always terminal.

Wayne 2 years ago

Thanks for the reply just went and Mass Air flow so not as bad as sounded. Thanks

Very helpful and Quick response..

Dave 2 years ago

Brilliant Hub! My 04 Traffic had been playing up for months. Very low on power below 2500 rpm and EML coming on, then was ok when turbo kicked in. It was almost embarrassing going uphill !

Changed the MAF sensor yesterday (pattern part from Eurocarparts) at a cost of £76 and took about half an hour to fit.



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Rain Defence 2 years ago from UK Author

Spot on, glad it helped.

Björn 2 years ago

Hello! very informing guide! I am noob when it comes to this so i am much obliged. I will try the egs/maf operation in some days.

Are you able to change the oil on primastar without removing the big plastic undercover?

My car has the symptoms of revving up very poor and losing power on thrust when "cold" i think and it has been a problem that turns up now and then, the car autorevs by itself when i push the clutch down.

In your opinion would it be a manageble task to also change the electric motor on the glass and to solve the fan not working unless set to 3,4 ?

very good instructions again!!

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Rain Defence 2 years ago from UK Author

Yes you can change the oil without removing anything although you will need a funnel.

Your problem sounds like a sticking idle control valve. If I were you I'd take it out and clean or replace it.

Good luck!

mark 2 years ago

i have a 2008 vivaro with 2.0cdti engine and sometimes splutters when driving and when under load going up hills etc chugs sometimes and once the red engine man light has came on and went off?

eny1 got an idea what it can be?

paddyoh 2 years ago

Hi I have a nissan prima star 04 u need to rev it up to 2500 rpm before it goes right what cold be wrong with it

Steve 2 years ago

Hi, I've read tons of these thread s and this one is far the best ., congrats .... I had all the problems as mention , replace maf as one of pickup inside fell off , clean the egr valve and inlet but some of gunk can go down vaq pipes and cause the boost pressure sensor to be faulty , i dumped this and join pipes together after cleaning them of gunk ! That I had blown down them in first place , and had full boost pressure , too much really , but with the yellow coil light on which meant after 20 mins of driving would go into limp mode , so invested in new Boost pressure sensor cost £48 !!! But 5 min fix , runs fine with correct boost and no yellow coil light on yepeeeee !!!!!! . So thanks for great info on this a Thread .

dawn h 2 years ago

hi have vivaro 1.9 di 02 plate have had new egr valve 3 month ago, maf meter yesterday , crank sensor cranckshaft sensor and sometimes it looses power seems to do it random but only on low revs when change from 1st to 2nd to 3rd gear 2500 to 3000 revs after that its ok could it be boost pressure sensor have no eml on dash please help this has cost me a fortune in parts time etc and loss of earnings I am self employed thanks

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Rain Defence 2 years ago from UK Author

You're welcome, thanks for your comment.

Steve 2 years ago

Been Struggle to find the problem with my van for months , finally found

your pages , Maff sensor contacts broken, so replaced it and took the

time to take off the egr valve and give that a clean out , at 92,000 miles

my primastar now runs like new with very smooth acceleration .

Can not thank you enough for spending the time to put up these pages

that have saved me both time and money

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Rain Defence 2 years ago from UK Author

Great to hear, I'm glad it all worked out for you!

James 2 years ago

Hi hoping you might be able to help. I have a 06 Vivaro. For the last month it won't start on cold mornings. After a jump start sometimes it starts, sometimes it doesn't. Later that day it may start unaided. The glow plugs were checked and are ok. The Airflow meter and the cam shaft sensor was checked/changed. Got the van back from the garage yesterday and same thing again, it wouldn't start this morning. You have any idea what to look at next. Its costing a lot of ££££ at this stage.

Ryan 2 years ago

Hi i have a Renault Traffic on a 57 reg driving feeling rough than usual, also while driving on a straight or motorway i have lost power completely and then kicks back in scary to be honest lights come on STOP and engine light. So restart the engine and all fine now and again does the same also slightly slugglish from start.

steve 2 years ago

Had recon turbo fitted to my 57 vauxhall vivaro after fitting lost power and strugling to start had maf fitted drove o.k for day then same problem again had another new maf fitted went for spin after about 20 mile red lights started to flicker on dash few mile later drove up steep hill then lost revs and cut out, couldn't get over 25 revs aa tow to garage, computer test shows fault with maf, fitted new one again and started up first time but not feeling confident. (how long will this one last) any sugestions ?

matthew 2 years ago

Hiya have a 05 1.9 dti blanked egr changed boots pressure unit. cleaned maf. And its still coming up with the coil light and turbo cuts out. also if I unplug the maf it just cuts out if any idear please help cheers

Mike Nicholl 2 years ago

Thanks for your great info on Maf and EGR on Dci100.Done the job.Replaced maf turned Egr 180.My Van now goes superb no loss of power . Thanks again from a very pleased Traffic owner.

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Rain Defence 2 years ago from UK Author

Pleased to help! Thanks for your comment.

rfe003 2 years ago

Just used your other tip for cleaning MAF sensor and worked a treat, van is now running like a dream. Next job is now going to be the ERG valve, just want a look at it to see how bad it actually is then I'll make a decision to block it off when I see how bad it looks. Great information and thanks.

Stuart wheeler 2 years ago

Hi mate your knowledge on these vans seems second to none in comparison to what crap I have been fed of late. I was hoping you could possibly help me out.. Basically I have a 1.9 opel vivaro 02 reg. over Xmas had a few issues with it running extremely sluggish and then eventually conked out and wouldn't start.. Had it towed to various garages and in the end had MAF done and replaced injector wire and all was good but at a massive cost.. To my dismay 2 days later the cam belt went and water pump.. Got that done and another 3 days later fuel filter! Got it all sorted but my patience was wearing thin. Then I began to realise that I would be driving along and the glow plug light would come on followed by the speedo stopping working and losing power not going past 2000 revs etc. it's really frustrating because I have spent so much and just don't wanna be in this situation! I have spoke to various mechanics and basically they have no idea other than 'get rid' . I'm a self employed roofer and need my van as it's my livelihood and having put about £800 of repairs into it wouldn't wanna sell. Got a mate to put it in diagnostics and all that came up was 'ho2 heater circuit high'. Any advice would be amazing mate! Thanks. Stu.

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Rain Defence 2 years ago from UK Author

Hi mate I'm not that knowledgeable really, just an keen amateur! Where are you as I do know an excellent travelling mechanic?

stuart wheeler 2 years ago

I live in bodmin, cornwall mate. Any ideas?

Elisabeth 2 years ago

Hi There. Thanks for this information. I've got Nissan Primastar 2007 1.9. I had a diagnostic run on it (not by Nissan themselves but a reputable place none the less) and they told me that the Air Mass Meter and the IAT - Intake Air Temperature sensor are both non working. I find it strange that both are not functioning and I do not have a lot of spare money to buy parts and hope that they are right. The problem with the vehicle is that its very sluggish going up a hill. I will have to go up a hill in second gear and it just goes nowhere. I also cannot do more than 130km / h with it. Other than that it runs well on the straight, it accelerates well. Do you think it could be the MAF as they have told me?

jim 2 years ago

Hi u might get to help me please i have 06 renalut master. i had it but on machine. faults were turbo charge senor and heater ? Two faults. i replaced the map senor think that was the turbo charge senor bout mean the same thing but when i put it on the machine again the faults are still there they faults are 1804 and 1826 can u help me please when i rev 3000 and take my leg of it ticks. over a little faster

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Rain Defence 2 years ago from UK Author

It is a common fault with these vans so it's probable/possible. Is there any way you can try another before shelling out for a brand new one?

Rochie888 profile image

Rochie888 2 years ago

Hi , great reading, great information. And many thanks for the information. Maybe you can help me, my 06 Prima Star starts fine in the morning, however after it's running for a while when it is turned off and started up again the engine takes longer to fire up. I have to turn the engine over longer for it to fire up. Any helpful advice will be appreciated

Rob G 2 years ago

Hi. Thanks for all of the advice. Another challenge for you to see if you may have any cunning idea's what the issue could be: I have had to replace my MAF sensor 3 times in 3 years. Any idea what could be causing the damage? Every time it gets replaced the problem is fixed and then after a little time the power issues / jerking at around 2000rpm start again. The air filter seems in good nick and is working properly on the inlet side, on the other side there seems to be some way for the air to travel before getting to the engine, so presumably no heat/contamination issues coming from the engine. The MAF is fairly clean looking, so a real puzzle????

Mikey RT1.9 06 REG 2 years ago

Best guide on the entire www on Renault Traffic. Followed it and confidently successfully cleaned the MAF and EGR valve. Would be amazing if you did a glowplug change guide too! Go on...

Rain Defence profile image

Rain Defence 2 years ago from UK Author

Thanks for your comment, they're what makes it worthwhile! I'll get on with more guides soon.

john lawrence 2 years ago

put second hand engine in primastar 54 plate had trouble starting it at first. got it started. running for afew days. went ton start it onother day no goy. any idears

Johan V Biljon 2 years ago

Hi I have a problem with my 2008 Primastar , when it gets to around 120Kmh it just cuts out , like the engine keeps running but the turbo is switched off ,by turning the ignition off and on it will be fine again

It feels like the turbo is been starved and then switches off , did the MAF an EGR as above ( great article) and it seems that it has more go initially but when pushing it , it cuts out ..... any advice

Rain Defence profile image

Rain Defence 2 years ago from UK Author

Although it could be lots of things it sounds like a fuelling issue to me, I'd suggest getting fuel pump and filter checked out.

Jul 2 years ago

Hello everyone,

I would like to replace the MAF by a diode. Do you (or other members) know the value of this diode and how to connect (which connection numbers of the plug)?

Thank you much!

Kind regards,


Opel Vivaro 1.9DTI 2005

JulVivaro 2 years ago


Great article! I did what you told and it work perfect. Thank you so much for sharing this!

Now an other question. Because the EGR is not used now .. the MAF is also not needed anymore. I understand that the MAF can be replaced by a diode on the plug.

-Does someone know which value the diode need?

- Which pins do I need to use with this diode?

I drive: Opel Vivaro 1.9DTI, 2005

Thank you much!

Kind regards,


ben mason 2 years ago

hi I have a 2002 1.9 vivaro. since having the van I have replaced the egr valve because it was running rough and showing the egr fault, this solved the problem for a little while. Then the van was forever going into limp mode whilst going up hills, this fault fixed its self for a short time but came back with a vengeance and wouldn't start but now was showing cam position sensor fault which I changed and then was showing crankshaft sensor fault. after telling all this to another mechanic he said to change the engine harness which I did and now I am showing the cam position sensor fault which I can't seem to get rid of and it still won't start. Do you have any ideas?

Thank you Ben.

ben maon 2 years ago

the pump in the tank works and all filters have been changed. we have had it running on easy start and I have just taken the small fuel pump off which doesn't seem to be doing anything but I still have the cam sensor fault.

sany72 profile image

sany72 2 years ago from Romania

nice post

Julian Mew 2 years ago

I have two fault codes. One is 1826 which I believe to be a fault with the glow plug relay and the other is 1804 which is the boost pressure sensor. Where is this boost pressure sensor please? Also I have treplaced the pressure control valve because it was noisy and the new one is also! Van is a bit sluggish below 2000 rpm. I have done your egr and maf cleaning procedures.

stu 2 years ago

I have a 05 primastar starts eveytime runs ok but its throwing black smoke out of exhaust when accelerating been to garage for plug inthey say low boost pressure fault code and that I need a new turbo but another mechanic says boost pressue sensor any ideas thanks

Rain Defence profile image

Rain Defence 2 years ago from UK Author

Boost pressure sensor is a lot cheaper to try. Is the mechanic offering to put one in to try without you having to buy it? If so then give that a blast. It's not too uncommon to find mechanics who will do that so don't settle for one that tells you you have to pay for everything just to try it.

stu 2 years ago

With regards to my last post came home tonight and thught id try disconnecting the maf sensor after reading the above posts and took it for a drive approx 2 miles just to see if there was any difference to my amazment it ran near perfect no black smoke out of exhaust all lights off dash gone off but bit sluggish in low revs but no black smoke I reconnected the sensor drove same distance black smoke appeared again but lights on dashboard still off so the garage which I took it for plug in basically told me aload of rubbish saying the turbo had gone squeezed the boost pipe and reved engine the pipe expanded so must have pressure do I replace maf rather than boost sensor ??? Also took pipes off the intake sensor and there was suction so that must be ok

Stu 2 years ago

On the above post I decided to unplug the maf sensor and take it for a drive approx 2 miles and it was running sluggish in low revs but when driving it was fine no black smoke !!! Lights on dash went off can't believe it turbo was boosting plug it back in black smoke appeared again !!! So the garage I took it to we're lying should I replace maf and boost switch or just maf could it be maf giving wrong reading causing black smoke????

syd 2 years ago

Fantastic changed the MAS and cleaned EGR my van now fly"s

thanks for this post

Colin 2 years ago

I have a Nissan Primastar 2.0 diesel,2008,when the engine is cold, it will start with no problem but once the engine is warmed up and i turn of the engine, it want start again, I can hear a click noise from the engine but she doesn´t or even turn over. I can start the engine by pushung the van or wait for the next day and the engine will start with no problem. I´ve changed the battery already, so it can´t be a batery problem. Can you add any help or knowledge if it is a simply problem. Thanks

tony 23 months ago

when i start my 53 plate vivaro no revs for 30 seconds sometimes i even have to knock engine off and start it again , i all so seem to have lost power i don't have hardly any power in sixth mind the van is on 214000 miles ,i have looked after the engine changed oil every 4/6 months any ideas why no revs


Julian Mew 22 months ago

Further to my 2004 Nissan Primastar problem. Glow plug light now comes on and at the same time the pressure control valve makes a loud noise and performance drops away. I have replaced this valve with a new one but the same symptoms appear. Any ideas?

Aussie sparky 21 months ago

So was on my way to my first job this morning when my traffic van decided to run really slow on low revs, pulled over and decided to Google what might be the problem and found this post. 25 minutes later and $11 for some contact cleaner and my van now runs better then I can remember. Thanks for the detailed and simple to follow instructions

carpet mark 20 months ago

I cleaned the MAF sensor and EGR valve on my 53 plate Vivaro 1.9 as it would not rev up before, I also noticed the air filter was very clogged up so I started the van up without the air filter in and it revved up perfectly, I thought I would turn it off and go and get a new air filter before I took it for a spin, however when I tried to start it again it will not start at all, I have checked that fuel is getting through, removed and cleaned the egr again, disconnected the maf sensor and still no joy, any ideas?

Kevin Wakey 16 months ago

Recent problem with Traffic 58plate. slight judder then loss of power for a second then power banged back in. Seemed like complete shut off then immediately back on. Stuttering on pick up from traffic lights etc. Will try MAF then check EGR if no improvement. Brilliant advice throughout!!!! Hope I've caught it at early stage????

Craig 15 months ago

Hi there got a Trafic 2.0 2009 just had engine reconditioned and been running fine but sounds like a old diesel transit. Also every now and then seems to be a flat spot when driving and sometimes will be at a junction put foot on revs to set off but nothing there but then kicks in after a second or so been told maybe Mafia sensor any ideas would be much appreciated.

Gary Simpson 14 months ago


I changed the Maf sensor and the van is now running well, but the engine management and stop light is still on. Is it ok to drive like this?

ian 14 months ago

I am a complete novice with engines.. I have a vivaro but my speedo wont work... please help but keep it simple

jrw2608 13 months ago

Hi i have a Renault traffic 2005/06?, 110k 1.9 lab.

I have been following the hub, and implementing advice from the hub to try to resolve an ongoing problem. With not much luck, but seem to have narrowed the fault down, I wonder if any other person has same or can offer help,

The van starts up every time, but at times will not pick up revs when peddle pressed. This seems to be linked to heat ! As in air temperature. I can drive 5 miles, get out to buy materials , get back in van within say 5 mins, and the van will start but no pick up in revs,. Switching off/ on may resolve problem, or just wait a while say 15 mins and then it's fine.

I say this seems heat related as in last winter in cold months the van behaved .

The other problem is that some times at a junction, as I approach or slow to turn into another road the van will cut out.

I have changed mafsensor , turned erg valve around, changed fuel filter, garage has changed crank shaft sensor and plug.

Last week the garage made a discovery that if you pumped the fuel primer while the engine was running, this would bring it back to life and the van would then pick up revs. So on this assumption I told them to replace the primer pump, hoping finally this would sort it, WRONG.!,

It's still the same, however at least I know how to get it going again.

Any one with ideas ?..

IT 12 months ago


I have 62 reg Primastar 1.9dci. Took it to West Way Nissan, Manchester for service and MOT two days before warranty expired. Suspiciously, car came back sounding rough and soon after "check emissons" error message came on dash. Dealership took it back to fix twice and said they'd reset the EGR which made the error message go away only for an hour. Then they said that they replaced the EGR which should definitely solve the problem. But again, an hour after driving off "check emissions" reapeared. Their standards of service are such that I don't beleive a word they say. Any clues as to what could be the actual problem and a solution to it? Would be very greatful!

Kev 10 months ago

Cleaned Maf and EGR reconnected now my Vivaro wont start any ideas, Thanks in advance

prowl 9 months ago

hi, does anybody know correct live data for air flow on idle and at 2000rpm?

dave 9 months ago

Hi, been having power issues with my 06 Renault traffic, starts OK and runs with no dash lights illuminated but just seems to have no power.will get up to speed eventually but has lost all exceleration, could this be either a dirty fuel maf or as I suspect the turbo boost sensor

Alun 7 months ago

Some great advice, only thing is I've tried unplugging my MAF sensor but it cuts out immediately. All other posts say that their engines run better. Can someone advise me what is wrong .

leelsa 6 months ago

hi i when i get to a certain rev van loses power and wont rev no more,so i has im going along switch engine on and off it cures it till i go over certain rev a rev of about 2000 i cleaned the EGR valve which was baked by the way,but still not cured the problem and i cant see it being the maf sensor as it runs fine till over certain rev any ideas friend.

graham 6 months ago

thanks my good man , did exactly the same as you described found your instructions , made it all so easy . thanks again

Trevor 3 months ago

Thanks for sharing your knowledge, did your egr and maf procedure, my 2006 vivaro runs like new !!

49er 2 months ago

Excellent details,instruction etc practically idiot proof many thanks

Paula 2 months ago

This is a really interesting and well put together article, thank you

My 1.9 Vivaro kept going into limp mode and the RAC told me I had to replace the EGR Valve, I did this and it still kept going into limp mode so I called them again. They then told me I had to replace the MAF Sensor so booked it in the garage and had that changed but it still keeps going into limp mode! If I unplug the MAF Sensor then everything runs lovely, do you have any suggestions please? The van is a 2005 SWB :-)

darrann 5 weeks ago

Hi We have Renault master 2.3 2012 engine failed to start , brake warning on dash , i assume front pads are worn and has activated the sensor, is it normal for this to shut down engine some advice would be appreciated.

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