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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 by following a few simple steps. 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 primary remote. The most common causes for car remote key failure are circuitry or battery issues. Battery The battery in the key fob may get worn out over the course of time. It is easy to replace a battery. However it is essential to select the right kind. You can refer