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knock sensor

  1. E39 M5 2000 limp mode problem and rich exhaust smell

    E39 M5 and E52 Z8 Discussion
    Hi all! I have a few concerns if anyone can help me out with any of their advice if this has happened to them!! Friends have told me while driving behind my car that they smelled rich exhaust... I have an issue with a knock sensor and a engine light that comes on and off... but I'm wondering if...