Consider your ground straps. Do a search for threads where the strap was bad...see how to diagnose, compare symptoms. By using a jumper cable you can 'bypass' the engne/chassis ground strap to see if it has failed.


Im not sure what PRECISE ITEM will cause the symptom you see. It is possibly that something failed, maybe damaged the JBE or FRM, which causes odd electrical stuff.


Finally, I know having a car problem can be frustrating...chillax. Complaining to us...badmouthing BMWs as if that will embarass the marque into maing your one car 'behave' is pointless.... ) Also, having crappy indy mechanics AND having to rely on BMW dealers is brutal. (Oh, the dealer prolly didnt tell you squat because they wanted $1100 first. Why would they give you a speck of info that might help? they are thieves with fancy coffee machines....)