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How to Fix That isn't Working If your key fob doesn't work then you can fix it by following some simple steps. First, check to make sure it's not the backup remote. If the backup remote is able to lock and unlock your car door, then there's a likely issue with the main remote. The most frequent causes of key malfunctions for car remotes are circuitry or battery issues. Battery The battery inside the key fob could be worn out over time. It is quite simple to change out a battery