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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 a few simple steps. First, check to make sure 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 isn't functioning. The most common causes for car remote key failure are battery or circuitry issues. Battery The battery inside a key fob can wear out over time. It is simple to replace batteries. However, it is important that you use the correct type. You can r