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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, ensure that it's not your backup remote. If your backup remote cannot unlock and lock the doors of your car, it is most likely that the primary remote isn't functioning. The most common causes for key malfunctions for car remotes are issues with the circuitry or battery. Battery It is not uncommon for the battery inside the car key fob to wear out. It is simple to replac