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  1. engine problem anyone know what is up???

    E39 M5 and E52 Z8 Discussion
    ok driving around town my car is fine but when sport mode is activated and i redline in third or fourth gear my car goes into limp mode it will make it home but with very little power. exhust tone is very low. i tried turning it off and back on and the problem is 100% gone. o2 sensors? i forgot...