1997-2003 BMW 5 Series Key Battery Replacement (1997, 1998, 1999, 2000, 2001, 2002, 2003) - iFixit Repair Guide
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TUTORIAL: How to replace / change key fob battery on BMW X1 X2 X3, X4, X5, X6 (2017-2020) IN 5 STEPS - YouTube
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BMW Remote: How to Change Battery (2014-2022) X1, X2, X3, X4, X5, X6, M, Series 2, 5, 6, 7, etc - YouTube
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