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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 some simple steps. The first step is to make sure it's not the backup remote. If your backup remote is unable to unlock and lock the doors of your vehicle, it is most likely that the primary remote isn't functioning. The most common causes for key problems with your car remote are issues with the circuitry or battery. Battery It is not un