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Old 11-21-2011, 01:38 PM   #44
Registered User
Join Date: May 2007
Location: SF Bay Area
Posts: 165
My Ride: 2003 330i ZHP
Would a dirty MAF cause a P0171 or P0172 code error? I just tried to smog my car and it didn't pass the functional test because of these errors. I had one of the tubes at the MAF replaced about a year ago so I'm wondering if this is related. The car has been idling rough for a while (it sounds like it wants to turn off every few seconds but it keeps running). That characteristic corresponds to the check engine light that turned on around the same time.
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