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How to Fix a Key Fob That isn't Working If your key fob does not work, you can fix it by following some simple steps. First, ensure that it's not the backup remote. If your backup remote is unable to lock and unlock the doors of your car, it is likely that the main remote isn't functioning. The most common causes for key problems with your car remote are circuitry or battery issues. Battery It is not uncommon to find a battery on the key fob for cars to degrade. It is quite simple to repla