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Mercedes Benz C180K 1.8 2005 - Codes P2058, P201C, P0170 and P0171 relating to fuel trim #

Posted by Lee Morton on July 3, 2013, 3:00 pm

Year of Manufacture *: 2005
Engine Size and Code *: 1.8
( Optional ) ECU Type: siemens
( Optional ) Scanner Used: modis
( Optional) Fault Codes: p201c p2058

chassis wdc2030462r189895

Hi guys

Got a Mercedes c180k came to me last week with a p2058 and p201c or in the eobd side p0170 p0171 relating to fuel trim the car has been to a few garages that have fitted both oxygen sensors which i'm told are(NGK)NTK, a non genuine cat and a non genuine air mass meter after a chat with the customer he agreed to change the air mass for a Siemens unit then let me have a look .
so far I cant find any air leaks with the smoke pro and fuel pressure is around 4 bar which is ok according to autodata, air mass trace is good and lambda sensors react to changes in mixture.
I found the one way valve under the inlet that's common for failing and this one had, new one fitted job fixed I thought but no light back on after a few test drives
I have checked the cam position actuators for leaking oil after searching on here and they are slightly but there is no oil getting to the o2 sensors or ecu multi plug so don't think its this or could I be wrong?
could the adaptions need resetting the car has done about 200 miles since I fitted the breather valve would this be expected to adapt by now or does it have to be reset I have a snap on modis that gives me an option to reset sensor adaptions but I have no confidence that it actually does it being snap on can anyone answer these questions or shed any light my way thanks lee

Re: mercedes c180k chassis wdc2030462r189895

Posted by Ray Mahon on July 4, 2013, 1:54 pm, in reply to "mercedes c180k chassis wdc2030462r189895"
Edited by board administrator July 8, 2013, 2:04 pm

Have you monitored what the fuel trims are doing on a test drive.
They will also indicate if the adaption has been carried out successfully.

Re: mercedes c180k chassis wdc2030462r189895

Posted by Lee Morton on July 4, 2013, 5:16 pm, in reply to "Re: mercedes c180k chassis wdc2030462r189895"
Edited by board administrator July 8, 2013, 2:05 pm

yes I have since had adaption reset on a mb star and fuel trims were reset but on test drive afterwards short fuel trim is adding between 12 and 18 % and then starting to add long fuel trim obviously because the short is so high .
I'm sure from memory on the mb star the code p201c related to mixture adaption too rich which is confusing me as surely if it was it would be taking fuel away the only other code was p2058 lambda control but I cant remember the rest of the terminology
thanks lee

Re: mercedes c180k chassis wdc2030462r189895

Posted by Simon Forsey <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5231' width='330' height='300' border=0 style='border:none;'> on July 14, 2013, 6:39 am, in reply to "Re: mercedes c180k chassis wdc2030462r189895"

Hi

Had one of thesewith exactly the same problem. Very confusing because the fault code is reporting a rich mixture when the fuel trims are obviously lean!

You have sorted the most common lean problem with these by changing the piping under the inlet manifold. I must confess, aftermarket o2 sensors are not best for these,with the front one being broad band. I have seen them fail quite quickly.

The problem our one was drawing air in through the rocker cover gasket and the oil cap. The Smoke Pro did not show this up.

Worth a look.

Simon

Re: mercedes c180k chassis wdc2030462r189895

Posted by lee morton <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3142' width='330' height='300' border=0 style='border:none;'> on July 16, 2013, 9:40 pm, in reply to "Re: mercedes c180k chassis wdc2030462r189895"
Lee Morton

Thanks simon ill have a look when its in next, Since i last posted i have had a an emmisions test done which showed it running very rich but at the time storing running lean codes with fuel trims on around +18% am sure we either have a faulty pre cat sensor or a problem between the sensor and ecu or maybe the oil from the cam sensor/actuator is worse than i thought
thanks lee

Re: mercedes c180k chassis wdc2030462r189895

Posted by keith brown <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1429' width='330' height='300' border=0 style='border:none;'> on July 17, 2013, 12:01 pm, in reply to "Re: mercedes c180k chassis wdc2030462r189895"
Keith Brown

no mention of an exhaust manifold leak!
i find the smoke pro very usefull but it can sometimes misslead you if its not posistioned correctly
had a honda & put it up the tail pipe & showed nothing,took the centre pipe of & hey presto small leak at manifold,
easy to forget logic here the front sensor thinks its weak, hth keith

Unresolved #

Posted by Lee Morton on September 12, 2013, 10:44 am, in reply to "Re: mercedes c180k chassis wdc2030462r189895"
Edited by board administrator September 19, 2013, 6:46 pm

marking this one as unresolved for now although it is suppose to be coming back in at some point

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