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Key Fob Repair: Replacing the Battery When they are tossed around in pockets and purses, key fob buttons can be damaged and not register presses accurately. This issue can be resolved by replacing the battery that is typically found in the snap-out cases of most car fobs. If the contacts on your key fob have worn, a new replacement might not be enough to make it work again. This is a simple fix you can perform at home. Replace the Battery It may be time to replace the battery