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How to Repair a Car Key Fob The key fob of yours is tossed around a lot, and the buttons could get stuck or broken. If you need to, give it a good cleaning and replace the battery. Most cars use the coin-style battery, which you can buy at pharmacies or big box stores as well as home improvement stores. Some models require programming equipment that is available only to dealers. Dead Battery The car key fob makes it easy to start your car and then get it started. What happens when you press the b