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OK i just got back from the dealer... took it for a test drive and the light came on a few times. While driving, the technician entered the hidden diagnostic menus (by pressing and holding the right button that produces "CONTROL CHECK OK"), and he went into one setting that monitors the voltage. The voltage was steady between 12.8 and 13.1 which is normal, and even when the battery light came on, the voltage held steady. So the battery is OK even after 5 days since the problem started. I need to take it back for a more thorough check of the alternator. But on the 45 minute drive home, the light didn't come on at all, and the only difference was that I had the headlight switch on 0 instead of A (i always had it on A)... coincidence? Strange.
Comments?
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2006 BMW X5 4.8is (current)
2006 BMW Z4 3.0si (current)
1992 BMW E30 325i cabrio M-tech (RIP)
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