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2003 Mercedes c230 code help/suggestions

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Feb 21, 2017, 2:40 PM

Post #1 of 3 (745 views)
2003 Mercedes c230 code help/suggestions Sign In

hey does anyone have suggestions with whats going on? so im getting codes p0170 p0172 p0140 and i have had misfire code p0300 the car run smooth idles perfect when sitting running you smell super strong exhaust also i do feel power loss and if you go to punch it it will cut in and out loosing power and after that is when you will get the misfiring and stuttering then when you just try to go just regular after you have floored it its missing bad but you turn the car off and turn it right back on it runs fine until you try and punch it. so just loss of power very strong bad smelling exhaust and after flooring it bad missing. i did change the downstream o2 sensor 8 months ago when other codes showed that was bad they cleared out and one day was sitting with the car running and these new codes just started showing up first was p0172 then p0170 and most recent p0140... some people say with all these codes sounds like a bad vac leak some people say sounds like MAF but im not getting any direct codes for MAF and MAF sensor seems to be reading ok on scanner tool when you watch the numbers while running and driving so i am clueless where to start now.

(This post was edited by wes1987 on Feb 21, 2017, 2:46 PM)

kev2 profile image

Feb 21, 2017, 4:20 PM

Post #2 of 3 (730 views)
Re: 2003 Mercedes c230 code help/suggestions Sign In

What is the scanner showing for voltage B1S2 (p0140) -
The other codes are mixture issues, noting bank 1 - being to rich. what is scanner showing for FT's. B1S1 voltages?
Might want to look at plugs B1- a leaking injector, maybe a fuel regulator,

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Feb 21, 2017, 4:50 PM

Post #3 of 3 (724 views)
Re: 2003 Mercedes c230 code help/suggestions Sign In

hey thanks for the reply i will have to see what the voltage is reading and the long term fuel trim B1 was 17.96!!! and the short term was 2.34. and i guess it took this reading at 2600 engine rpm i saved the report thats what its saying. oh yeah and the MAF gets up past 90 gs or how ever its measured when i accelerate pretty good. like 90-120 reading

(This post was edited by wes1987 on Feb 21, 2017, 4:54 PM)

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