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Discussion Starter · #1 ·
Just wanted to post a bit of information for any of you that have been having negative LTFT issues. I purchased a CAI 2 months ago shortly after buying my 2002 330ci. Since then, I have been dealing with P0172 and P0175 error codes. After weeks of trying to trace down potential causes, like MAF and O2 sensors (luckily never replaced them) I finally decided to reinstall my stock air box. What do you know.....Problem solved.
My LTFT was running at a constant -8.9% on both banks. O2's and MAF all checked out as good (diagnosed with Launch scanner). Only thing I replaced were the spark plugs based on service history.
My LTFT is now at a constant 2% to 3%.
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