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How to Fix a Key Fob That isn't Working If your key fob isn't working There are a few simple steps that can fix it. First, make sure that it's not your backup remote. If the backup can lock and unlock your car doors then there's a likely issue with the primary remote. The most common causes for key malfunctions for car remotes are issues with the circuitry or battery. inside the key fob could wear out over time. It is easy to replace the battery. However it is crucial that you choose the right kind. You can refer to your