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How to Avoid Key Fob Replacement Costs Key fobs are useful but they can also be problematic. It's important to maintain these devices to avoid costly repairs or replacements. The most frequent cause of fob problems is battery failure. The simplest solution to this problem is to replace the batteries. This can be done at the majority of hardware stores, or even at some big-box stores. Replacement Batteries It's possible to replace the battery if your key fob is requiring se