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Car Key Fob Repairs Like any electronic device, car key fobs can have issues with their function. Many of these issues are relatively easy to fix. For instance, replacing the flat battery on a key fob will cost $10 or less, and is possible at most hardware stores and online. Certain repairs, however, require the assistance of a professional shop or dealer. Dead Batteries The most common problem that prevents key fobs from working is a dead or weak battery. The good news is that this can be fixed easily particular