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  1. 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...
    dtc p0171 p0174 tuner
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