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How to Repair a Dead Car Key Extreme cold or heat can cause a car to stop working. It is best to wait a few minutes before replacing it. If your car keys get damaged it can be a major problem. And it always occurs at the worst moment! You can repair a broken key without the need to purchase a new one. Dead Key Fob Battery Modern key fobs let us unlock doors, trunks and tailgates easily without the need for a car key. Some key fobs even come with a built-in key that can be used