Will air leak after MAF cause rich condition?
Just failed smog today for the first time in 90k miles of being supercharged, with my CO2 and HC about double the max allowed! The car has brand new cats, maf, injectors, relatively new 02 sensors, and the car runs ok for the most part. The car also threw three codes a few weeks ago: -Pre Cat 02 sensor response time, cyl 1-4 and 5-8, and -Catalyst efficiency cyl 1-4.
My suspicion is that the last shop to work on the car may not have attached my hoses correctly and there is an air leak after the MAF. Would that cause a rich condition that would account for my situation?