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: Replacing the Battery Getting jostled around in purses and pockets key fob buttons may be damaged and not register presses with accuracy. Replacing the small battery, which most car fobs come with in a snap-out bag, can fix this issue. However, a fresh replacement could not be able to revive your key fob if the switch's internal contacts are worn out. This is a simple fix that you can do at home. Replace the battery It could be time to replace the battery in your key fob if it isn't working or takes longer to unlock or lock your car than it does on