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b2 b3

  1. E39 M5 and E52 Z8 Discussion
    I have been trouble shooting rough idle / B2 B3 AE AF / touchy throttle problems since I bought my car. After a VANOS O-ring refresh, valve cover gaskets (redid the job and they now appear perfectly seated), I still had touchy throttle and B2, B3 codes. I figured the B2, B3 could be lingering...