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How to Fix a Key Fob That isn't Working If your key fob doesn't work There are a few simple steps that can be taken to fix it. The first step is to be sure it's not the backup remote. If the backup remote is able to lock and unlock your car door, then there is likely an issue with the main remote. The most frequent causes of car remote key failure are circuitry or battery issues. Battery The battery inside the key fob may be worn out over time. It is simple