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Not only does your chassis have a built-in LED code retrieve system from the DM to check for CE light activation causes, it also has owner access to all the other modules [ HFM/SFI engine management systems] with a simple LED tool that cost all of $5 to make..
BMW...... Better ??????
Print this out for your friend
http://www.peachparts.com/shopforum/showthread.php?t=107630