ask the poor soul on the M5board what they did to his E60 M5 on "test" drive after a routine maintenance service....its all over the internet.
I understand that even w/a GT1 computer, when it comes to a CEL, you need to hook up the thing after the light is thrown....BUT...I had an issue like that and after 100 miles and 4 tries they could not fix it!....only on the 5th try whatever they did seem to work.
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