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How to Repair a Car Key Fob The key fob is jostled around a lot, so the buttons may be damaged or stuck. If it is necessary, give it a good cleaning and replace the battery. Most cars are equipped with the coin-style battery, which you can buy at pharmacies or big box stores as well as home improvement stores. However certain models require special programming equipment that dealers only have. Dead Battery The car key fob makes it easier to start your vehicle, and then get it started. What happens when you press the button multiple times and