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Key Fob Replacement and Repair Modern car key fobs are used frequently and are often abused. In most cases, a simple repair or replacement is all you need to get them working again. Most fobs run on a flat watch-style batteries, which is readily available in auto parts and hardware stores. However, before calling an expert, you can try a few DIY fixes! Dead Key Fob Batteries The battery in the key fob's remote powers your car's remote and in push-to start cars it will start