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1997-2003 BMW 5 Series Key Battery Replacement (1997, 1998, 1999, 2000, 2001, 2002, 2003) - iFixit Repair Guide
Non comfort access key battery life - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
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