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Car Key Fob Repairs Key fobs today do a lot more than unlock and start vehicles. However, the added complexity could cause costly repairs if one of them breaks. The good news is that most fobs use flat watch-style batteries that are simple to replace at home. And you may find that a reset will get yours working again. Battery Replacement A dead battery is the main reason for a key fob that isn't working. It's a simple repair, and is worth trying before you spend money on a new key fob. Simply take y