How to unlock and start your BMW with a dead key fob
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Amazon.com: Car Key Fob Replacement For BMW X3 X5 528i 535i 750i xDrive KR55WK49863 CAS4 Keyless Remote 315MHz FCCID:KR55WK49863;by AUTO KEY MAX (1) : Automotive
BMW X3 E83 Key Battery replacement - iFixit Repair Guide