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How to Fix a Key Fob That isn't Working If your key fob doesn't work then you can fix it with a few simple steps. First, check to make sure it's not your backup remote. If your backup remote is unable to unlock and lock the doors of your car, it is most likely that the primary remote isn't functioning. The majority of car remote key malfunctions are caused by circuitry or battery issues. Battery The battery inside the key fob may be worn out over t