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How to Fix a Key Fob That isn't Working If your key fob isn't functioning There are a few simple steps that can fix it. First, check to make sure it's not the backup remote. If the backup can lock and unlock your car door, then there's a likely issue with the main remote. The majority of car remote key malfunctions are caused by circuitry or battery problems. Battery The battery in the key fob could wear out over time. It is easy to replace a battery. However it is crucial to select the right kind. You can che