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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, ensure that 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 primary remote. The most common causes of key problems with your car remote are circuitry or battery issues. Battery The battery inside the key fob may get worn out over the course of time. It is fairly easy to replace batteries, but it is essential to ensure you choose the correct type and yo