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Key Fob Repair: Replacing the Battery The buttons on key fobs may become damaged and stop functioning properly after being jostled in purses and pockets. Replacing the battery, which the majority of car fobs have in a snap-out bag, can sometimes fix this issue. If the contacts on your key fob have damaged, a new replacement may not be sufficient to make it work again. It's a good thing that this is an easy fix that you can do at home: Replace the battery It may be time to change the batte