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How to Fix a Key Fob That isn't Working If your key fob won't work then you can fix it by following just a few steps. First, check to make sure it's not the backup remote. If your backup remote can unlock and lock the doors of your car, it is most likely that the primary remote is not working. The majority of car remote key malfunctions are caused by circuitry or battery issues. Battery The battery inside the key fob could get worn out over the course of time. It is fairly easy to c