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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, make sure that it's not your backup remote. If the backup is able to lock and unlock your car door, then there is likely an issue with the primary remote. The most common causes for key malfunctions for car remotes are battery or circuitry issues. Battery It is not uncommon for the battery in a car key fob to get worn out. It is fairly easy to replace batteries, but it is essential to make sure that you