W204 in limp mode.

Bighamps

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Joined
May 9, 2016
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Ware
Your Mercedes
CLS400 2016 W218
I took my car for diagnosis and the error code pointed to the EGR valve.

They fitted a new one and it went into limp mode on the way home. They have tried various things including new hoses and replacing the engine exhaust temperature sensor.

So, today I bought an ODB reader and the code was P0401 Exhaust EGR Flow Insufficient.

It’s a W204 350 CDI 2010.

Any ideas what they have missed!
 

onefortheroad

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Dec 8, 2015
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uk.
Your Mercedes
Me -2019 GLC 350 coupe AMG line. Mrs- ford kuga 65 plate awd powershift .
Common Diagnosis Mistakes
Replacing the EGR valve without checking the air passages of the intake manifold or the temperature sensor
 

alexanderfoti

MBO Forum Supporter
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Mar 25, 2010
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Tonbridge
Your Mercedes
W221 S65 AMG - W204 C63 AMG + Various other MB's
Or checking that the maf is reporting the correct information.
 

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