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E46 330 Ci Auto July02-Electronics gremlins

:confusedBelieve it or not, my E46 wouldn't start the other morning. Unheard of I know, but add to that , the fact that the wipers were doing their own thing, the speedo was showing 140 mph at standstill, the rev counter was static at zero, and the dash was dead as a dodo, and I had a headache. Still do. My local BMW specialist reckons the positive lead on the battery was loose (he noticed arcing spots on the post), but despite the fault not reproducing itself while in the garage, the problems are back again now that I've got the car home. I've tried re-booting by touching the battery terminals together and waiting a few minutes before re-connecting, but no luck. The battery is healthy cos the engine cranks well but at times just won't fire. Other times, the engines starts fine. It's as though the electronics have a mind of their own. Worse still, it's obviously intermittent. Any ideas anyone? Please!...........
 
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