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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 just a few steps. First, check to make sure it's not your backup remote. If the backup is able to lock and unlock your car doors, it is most likely an issue with the main remote. The most common causes of car remote key failure are battery or circuitry issues. Battery The battery inside a key fob can wear out over time. It is easy to replace a battery. However it is crucial that you choose the right ki