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How to Replace a Car Key Fob You're probably used to key fobs when you drive modern cars. These devices are a great way to can lock and unlock your vehicle's doors, but can also offer other convenience and security features. Sometimes these key fobs stop working or even break. CR talked to dealerships and other experts to figure out the most efficient method to replace a key fob, and also to learn savings tips. Dead Battery Many newer cars offer key fobs that allow you to unlock the doors and start the engine with a simple press of a button.