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  1. P0171 and P0174 - Fuel Trim System Lean Bank 1/2

    Factory Five GTM Forum
    I'm getting DTCs; P0171 and P0174 - Fuel Trim System Lean Bank 1/2. I've had my HP Tuner for a few weeks and just this past week-end connected to the GTM for the first time. Has anyone else encountered these DTCs? After cleaning the MAF and checking making sure there are no intake or vacuum...
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