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How to Fix a Key Fob That isn't Working If your key fob doesn't work and you're not sure why, you can fix it with just a few steps. The first step is to be sure that it's not your backup remote. If your backup remote is unable to lock and unlock the doors of your car, then it is likely that the primary remote isn't functioning. The most common causes of key problems with your car remote are issues with the circuitry or battery. Battery It is not unusual to find a battery on the key fob for