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Wow, Germans must be gullible! 1st mistake: you bought a 3 series on eBay 2) you knew the guy sold salvaged vehicles that was a big red flag to stay away. I hope you learned a lesson.
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If no codes are being thrown use Chevron Techron fuel injector cleaner (concentrate). It solves rpm fluctuating upon cold start-up. Also, for most BMW problems start off by scanning your car with the Peake Research Tool. It contains the actual BMW codes. If you want to register a newly installed battery for free (just buy a $10 cable) and google/download BMWLogger
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