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AAN running rich in closed loop

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  • S4Marc
    started a topic AAN running rich in closed loop

    AAN running rich in closed loop

    I'm hoping for some direction in diagnosing my poorly running 1996 Ur S6

    It seems that when on closed loop the engine runs extremely rich and occasionally cuts out

    Which sensor does the car use predominantly to alter closed loop fueling? MAF?

  • newsh
    replied
    Maf and lambda but do a boost leak test first.
    Any codes?

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