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How to Fix a Key Fob That isn't Working If your key fob isn't functioning A few easy steps can be taken to fix it. First, make sure that it's not your backup remote. If your backup remote can unlock and lock the doors of your vehicle, it is likely that the main remote isn't working. The majority of car remote key malfunctions are caused by battery or circuitry problems. Battery The battery inside the key fob may be worn out over time. It is easy to replace the battery. However, it is imp