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Car Fob Replacement Key It is essential to replace your key fob as soon as it stops working. A non-working key fob can make it difficult to start your car or unlock it. Fobs are usually powered by flat batteries that can be easily replaced at your local big-box retailer or hardware store. However, modern fobs include a transponder chip that needs changing to work correctly and requires specialized equipment that is typically only found at dealerships. Cost Car fobs can be expensive to buy if they are lost.