P0171 code

workhorse1workhorse1 Member Posts: 3
edited February 2019 in Audi
I have a 2007 Audi A-4 Quattro Cabriolet. It has new coil packs, new fuel filter, new Air mass flo sensor, throttle position sensor, but still throwing a P0171 code. Any suggestions , thanks John


  • Mr_ShiftrightMr_Shiftright Sonoma, CaliforniaMember Posts: 64,482
    Here's a GOOD TUTORIAL on the P0171 code. Seems like there's been too much guessing going on and a more careful diagnosis with a professional scan tool might be needed. Also, as the article states, vacuum leaks are a common culprit.
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