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How to Fix a Key Fob That isn't Working If your key fob does not work then you can fix it with some simple steps. First, check to make sure it's not the backup remote. If the backup is able to lock and unlock your car doors, then there is likely an issue with the primary remote. The most common causes for key problems with your car remote are battery or circuitry issues. Battery It is not unusual for the battery inside the car key fob to get worn out. It is relatively easy to replace a battery, although it is important to ensure you use the right typ