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Car Key Fob Repairs Car key fobs, just like any electronic device can have issues with their functioning. Fortunately, many of these problems are fairly simple to address. For instance, replacing the flat battery in a key fob costs $10 or less, and is possible at most hardware stores and on the internet. However certain repairs require expert assistance from a dealer an independent shop. Dead Batteries The majority of key fobs run on batteries, and the most common problem that causes them to stop working is an inactive battery. It's easy to fix