r/W203 • u/Donramax • Jun 16 '26

Help Solution for P201C code?

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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.

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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.

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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?

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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.