Quote:
Originally Posted by jeffchap
Has anyone else experienced a CEL with code P0172 (too rich) while using a K&N or other oiled filter? Mine has done it 3 times now. I've cleared the code and cleaned the MAF sensor, and it'll be fine for a week or two before throwing the code again.
Supposedly, oil build up on the MAF sensor is a myth, if you believe K&N. But as a test, I put the stock filter back in last night. I'll keep you posted.
It's possible that I have a faulty MAF sensor as well, but I haven't been able to find a replacement yet outside of the dealership. Anyone have a source? I haven't checked with the dealership yet to see how much they want for one, but it's not likely to be cheap.
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I have K&N air filter for the past 10k miles. No CEL or anything. Is your car completely stock aside from the air filter? If you are stock, try putting the stock filter back in like you said and run it for a few weeks. If the CEL still comes on, then go to the dealership and ask them to check it out.