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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 fix it. The first step is to make sure it's not the backup remote. If the backup is able to lock and unlock your car door, it is most likely an issue with the primary remote. The most common causes for key problems with your car remote are issues with the circuitry or battery. is not uncommon to find a battery on a key fob for cars to degrade. It is relatively easy to replace batteries, but it is crucial to mak