Honda and Acura OBD1 "Check Engine Light" Trouble Codes (1992-1995)

Updated on May 17, 2017

In every car's life, there comes a time when the dreaded CHECK ENGINE light appears. Not to fear. There are many resources you can use to check and diagnose these DTCs (Diagnostic Trouble Codes).

For 1992-1995 (OBD1) vehicles you can check these yourself by using the method shown in the picture below.

Location of OBD1 Honda Diagnostic Connector


In OBD1 Hondas and Acuras there is a diagnostic port and a two-pin connector located under the passenger-side dashboard. When checking the DTCs you will need to insert a jumper wire from one pin to the other in the two-pin connector. If you don't have a piece of wire around, it is also common to see people using paperclips to "jump" the two sides of the connector.

Once you have "jumped" the two-pin connector you now need to insert the key and turn on the vehicle. Your check engine light will then start to flash. Every long flash is a digit in the "tens" place in the code, and a short flash is a digit in the "ones" place. So if you see two long flashes and five short flashes, you have a Code 25. There will be a long pause between codes. Read all the codes until they start to repeat themselves. Then refer to the table below to get the meaning of each code.

For 1996 and newer (OBD2) vehicles, you can visit a local auto parts supplier, such as Advance Auto Parts, that offers free vehicle diagnostics. Most of these free services are restricted to OBD2 vehicles and will give you an immediate explanation of what the code is. As always, it's a good idea to write these codes down and do a little search online to see what other owners have run into when receiving the same codes.

The Most Common Honda and Acura OBD1 Codes

Codes 0 and 11
Electronic Control Module (ECM)
Code 1
Heated oxygen sensor A
Code 2
Oxygen content B
Codes 3 and 5
Manifold Absolute Pressure
Code 4
Crank position sensor
Code 6
Engine coolant temperature
Code 7
Throttle position sensor
Code 8
Top dead center sensor
Code 9
No.1 cylinder position sensor
Code 10
Intake air temperature sensor
Code 12
Exhaust recirculation system
Code 13
Barometric pressure sensor
Code 14
Idle air control valve or bad ECM
Code 15
Ignition output signal
Code 16
Fuel Injector
Code 17
Vehicle speed sensor
Code 19
A/T lock-up control solenoid
Code 20
Electric load detector
Code 21
V-TEC control solenoid
Code 22
V-TEC pressure solenoid
Code 23
Knock sensor
Code 30
A/T FI signal A
Code 30
A/T FI signal B
Code 41
Heated oxygen sensor heater
Code 43
Fuel supply system
Code 45
Fuel supply metering
Code 48
Heated oxygen sensor
Code 61
Front heated oxygen sensor
Code 63
Rear heated oxygen sensor
Code 65
Rear heated oxygen sensor heater
Code 67
Catalytic converter system
Code 70
Automatic transaxle
Code 71
Misfire detected cylinder 1
Code 72
Misfire detected cylinder 2
Code 73
Misfire detected cylinder 3
Code 74
Misfire detected cylinder 4
Code 75
Misfire detected cylinder 5
Code 76
Misfire detected cylinder 6
Code 80
Exhaust recirculation system
Code 86
Coolant temperature
Code 92
Evaporative emission control system


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    • profile image

      Luis 6 months ago

      I have a 92 Honda prelude but I'm getting the flashing codes from the D instead of the check engine light. So are those my engine codes????

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      pissed 8 months ago

      i get code 65 - Rear heated oxygen sensor heater - but my model car does not have a heated oxygen sensor its the non heated type.

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      wezzy 2 years ago

      Does anyone no what code 27 is

    • profile image

      Carlton Hammonds 2 years ago

      When I do the dinosaur on the check engine light it just turned off it doesn't blink what could be the problem 94 Honda Civic

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      Justin 2 years ago

      Vince if it stays on no flash that means ur ecu fuse blew under the hood

    • profile image

      vince 2 years ago

      Jus stays on wont flash

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      haseeb 4 years ago

      39-1 serial com failurs

    • profile image

      ch haseeb 4 years ago

      39-1 serial com.failure