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How to Fix a Key Fob That isn't Working If your key fob won't work, you can fix it by following some simple steps. First, make sure that it's not the backup remote. If the backup can 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 It is not uncommon to find a battery on a key fob for cars to wear out. It is easy to replace batteries. However, it is important that you
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