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Key Fob Repair: Replacing the Battery Getting jostled around in pockets and purses key fob buttons may be damaged and not register presses reliably. Replacing the battery, which a majority of car fobs have in a snap-out bag, can fix this problem. If the contacts in the key fob are damaged, a replacement may not be enough to bring it back to life. This is a straightforward fix you can do at home. Replace the battery If your key fob is feeling sluggish or takes longer than usual to unlock or lock yo