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How to Fix a Key Fob That isn't Working If your key fob won't work, you can fix it with some simple steps. First, ensure that it's not the backup remote. If your backup remote is unable to unlock and lock the doors of your car, then it is most likely that the primary remote isn't working. The most common causes for car remote key failure are issues with the circuitry or battery. Battery It is not uncommon for the battery in the key fob for cars to get worn out. It is relatively easy to change out batteries, but it is crucial to ensure you select the