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How to Fix a Key Fob That isn't Working If your key fob doesn't work A few easy steps can be taken to fix it. First, make sure that it's not your backup remote. If your backup remote is unable to lock and unlock the doors of your vehicle, it is likely that the primary remote is not working. The most frequent causes of car remote key failure are issues with the circuitry or battery. Battery The battery in the key fob could wear out over time. It is easy to replace batteries. However, it is important to select the righ