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What to Do When Your Car Keys Are Damaged It's not uncommon to lose or damage keys to your car. In many cases these situations, the problem are handled by a locksmith for cars. Adjusting buttons can restore functionality to fobs with keys that have been jostled. If the battery replacement isn't working, you might have to replace the fob. Dead Key Fob Battery Even though the old car keys that jingled are long gone, the fact remains that many cars have key fobs. They can be very useful however