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How to Fix a Key Fob That isn't Working If your key fob doesn't work and you're not sure why, you can fix it with some simple steps. First, check to make sure it's not the backup remote. If your backup remote is unable to lock and unlock the doors of your vehicle, it is likely that the main remote isn't functioning. The most frequent causes of key malfunctions for car remotes are battery or circuitry issues. Battery The battery in the key fob may wear out over time. It is easy to replace a battery. However it is crucial to select the right type. You