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- - Fuel Trim Malfunction (https://mercedesforum.com/forum/mercedes-c-class-10/fuel-trim-malfunction-45515/)

Josh L

Nov 9, 2010 03:24 PM

Fuel Trim Malfunction

I have a 99 c230 kompressor and I have a check engine light on showing a p0170 (Fuel trim malfunction). I have replace the Fuel Pump, Fuel Filter, Fuel regulator, Spark Plugs, and had it check for Vacuume Leak.. It seems that none of these have fixed the problem... Was wanting to know if an o2 sensor would cause this code to come up... Dose anybody have any Ideas...

platonmind

Nov 10, 2010 09:49 AM

Usual suspect is upper stream 02 sensor. In my case it was.

Josh L

Nov 10, 2010 10:01 AM

Thanks for your info.. I will try that out and post the final result...

Josh L

Nov 15, 2010 04:31 PM

Replaced the front o2 sensor and it fixed the problem... Thanks

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