I have a 13 plate diesel Zafira, and the engine spanner light came on back last summer, lost power, then it was ok until six weeks ago. P0409 is the fault code. I did 17 miles before it broke down in Longleat! Could it just be the Air flow filter?

Answer

The code points to an EGR sensor, check the sensor and the valve, it may be stuck. Other possibilities EGR solenoid and vacuum lines.

Updated on March 16, 2018

Original Article:

How to Test an EGR Valve - A Simple Procedure
By Dan Ferrell
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