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Mercedes E200 211 1.8 2004 - In for oil change, now code P2029 - Fixed #

Posted by Dominic Casey on September 22, 2016, 10:42 am

Year of Manufacture *: 2004
Engine Size and Code *: 1.8 Kompressor 271

Hi All,

I have the above car in for an oil change and now it's putting on the engine light with code P2029 Mixture format self adaptation (fuel trim). The fuel trim LTFT is 17% which suggests a vacuum leak, but i've checked all the usual suspects and all is fine. It also spits back a bit when cold but runs fine when warm. I know this car and have replaced all the vacuum pipes over the last few years. I know there are issues with these engines jumping the timing after an oil change, but I would have thought I would have a few more codes if that were the case. Plus the timing chain was replaced 25,000 km ago.The car has only done 124,000 km on the clock the same guy has it from new.

Any help on this would be much appreciated.
Regards Dominic.

Re: Mercedes E200 211

Posted by Chris Angus <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat5111' width='330' height='300' border=0 style='border:none;'> on September 22, 2016, 1:19 pm, in reply to "Mercedes E200 211"

PCV breather hose, is a usual suspect for this fault. Usually can hear it hissing, or if you spray a bit of choke and carb cleaner down to see if it picks up.

Re: Mercedes E200 211

Posted by Dominic Casey <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3313' width='330' height='300' border=0 style='border:none;'> on September 22, 2016, 1:27 pm, in reply to "Re: Mercedes E200 211"
Dominic Casey

Hi Chris thanks for your reply,The PCV hose and valve was replaced at around 100,000 km and I checked it yesterday and all is good.
Dominic.

Re: Mercedes E200 211

Posted by MICHAEL GORMLEY <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5597' width='330' height='300' border=0 style='border:none;'> on September 22, 2016, 4:31 pm, in reply to "Re: Mercedes E200 211"
Mick Gormley

Oil filler cap seal ?

Re: Mercedes E200 211

Posted by Fiachra Purcell <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3006' width='330' height='300' border=0 style='border:none;'> on September 23, 2016, 8:42 am, in reply to "Re: Mercedes E200 211"
Fiachra Purcell

Air mass meters can also cause fuel trim problems.
I have seen them over reporting @ idle and under reporting at partial / full load.
Get a genuine one.
Spurious ones are sh1t.
There are plenty of volumetric calculators online.

Fixed #

Posted by Dominic Casey on September 24, 2016, 2:29 pm, in reply to "Re: Mercedes E200 211"
Edited by board administrator September 26, 2016, 3:18 pm

Michael you were bang on the money,the oil filler cap.And it made perfect sense,the car ran fine until I changed the oil and filter.The cap is the only component I disturbed.I vacuum tested with the old cap and then put a new one on and the difference was evident straight away.Many thanks for all your help guys.Until time regards Dominic.

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