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Bmws are finicky with aftermarket batteries. They also need to be coded. Some have said it depends on battery if it needs coding. On my 2008 x5 I replaced it with genuine bmw battery myself and didn't get it coded. Then I started having all sorts of electrical issues. Just pay the stealer and get it done to be safe and not have a headache on this. I will never do this to a bmw again. My issues may be unrelated to battery on my older x5, but on my M5 I'm not chancing it when the time comes.
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