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How to Fix a Key Fob That isn't Working If your key fob doesn't work There are a few simple steps that can fix it. First, ensure that it's not your backup remote. If the backup can lock and unlock your car door, then there is likely an issue with the primary remote. The most frequent causes of car remote key failure are issues with the circuitry or battery. Battery It is not unusual for the battery in the key fob for cars to wear out. It is easy to replace the battery. However it is crucial that you use the co