Test battery charge and check alternator.
I drive a 2002 BMW 325i sedan. It will only start if its jumped, but once its running it runs perfectly fine with ZERO warning lights on for a few minutes and then the "service engine soon" comes on (and weird point, but the volume of my music goes up and down with the RPM's of the car). When I try to start it without jumping it, the "battery charge current" light comes on along with the "Engine oil pressure" light in red. Its good on oil, so I'm wondering if its seriously a big alternator issue or a small one... Taking to a mechanic tomorrow. opinions?
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