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Comfort access keys have a standard watch battery and do not recharge when the fob is plugged into the dash. Ultimatelty the battery dies and needs to be replaced. Non-comfort access keys are rechargable and charge while plugged into the dash.
To the OP, replace the battery in the fob and see if that does the trick...
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2021 X3 M40i
1974 2002tii, Inka, 5 sp manual
BMWCCA # 327475
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