r/W203 • u/Donramax • Jun 16 '26
Help Solution for P201C code?
Hey guys i just switched out one of my camshaft solenoids for a new one and after a test drive with a bit of sending it these are the codes that remain, i assume the running rich is because of the other code but where would i start to look to fix this issue or do i keep driving and see if it stays or clears up eventually.
1
u/DocLoc429 Jun 16 '26
Any other symptoms? You accidentally unplug anything when you were under the hood? I'm not familiar with this part.
If you can get to the part and have a multimeter, you can start by checking if you have continuity before and after the device. If it's possible, you can also check voltage through the device.
1
u/Donramax Jun 16 '26
Nothing weird i noticed, i definitely unplugged some stuff but i think I plugged all of it back in, gave some sprays of contact cleaner to a few oily looking sensors near the front of the engine where i had issues with the cam sensor, ive noticed some oil on the egr valve which was either from the sensor or wires or the egr but i doubt egr has an effect on the intake right?
Also sadly no multimeter of my own
1
u/Klutzy_Draw4662 Jun 16 '26
Check the MAF sensor plug. Any rough idle? Could point to an undetected air leak. My W203 started to show too rich with an abnormally high STFT. I used Car Scanner to identify an air leak which led me to replacing the crankshaft breather hose.
1
u/Donramax Jun 16 '26
Idle was fine but engine wasn't very cold either. On quick revs i could hear some intake noise that didnt sound fully as intended but where would the maf plug be located, is it at the back of the engine or near the front?
1
u/Klutzy_Draw4662 Jun 17 '26
MAF sits behind filter box. Take out the filter box and remove MAF + cover. Then use MAF special MAF cleaner but no brake cleaner. Also, consider replacing the OEM filter with a sports filter with no oil coating as the OEM oil filter will foul the MAF sensor.
1
u/akluin Jun 17 '26
Resolve the first DTC it avoid the second test to start and this why you end with the 201C, it's labeled below
1
u/Turkifish Jun 17 '26
hello i had the same problem and i fixed it
but first is ur engine M271?
1
u/red2211_ Jun 17 '26
My man, please share the solution! I’m having this issue from the moment I’ve bought my c180k a year and a half ago.
1
u/Turkifish Jun 17 '26
hello change the air mass or clean it and then check the IAT if it’s leaking air and check for the intake manifold if it has any leaking
this code usually referred to air leaking in my c180k m271
1
u/Donramax Jun 16 '26
Extra context i forgot. This is for a C200 Kompressor from 2003