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How to Fix a Key Fob That isn't Working If your key fob isn't functioning A few easy steps can be taken to fix it. First, check to make sure it's not your backup remote. If the backup is able to lock and unlock your car doors then there's a likely issue with the main remote. The most common causes of key problems with your car remote are battery or circuitry issues. Battery It is not unusual for the battery in a car key fob to wear out. It is fairly easy to replace the ba