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Key Fob Replacement and Repair Key fobs on modern cars do a lot of work and are subject to lots of abuse. In many cases, a simple repair or replacement is all it takes to bring them back into good working in good condition. The majority of fobs are powered by a flat watch-style batteries. This is readily available in auto parts and hardware stores. Before calling in an expert, try a few DIY fixes. Dead Key Fob Batteries The battery in the key fob powers the remote feature in your car. It also, with push-to-start