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How to Fix a Key Fob That isn't Working If your key fob doesn't work, you can fix it with just a few steps. First, ensure that it's not the backup remote. If your backup remote is unable to lock and unlock the doors of your vehicle, it is most likely that the primary remote is not working. Most car remote key failures are caused by circuitry or battery issues. Battery It is not unusual for the battery in the key fob for cars to get worn out. It is simple to replace batteries. However it is crucial that