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How to Avoid Key Fob Replacement Costs Key fobs are handy, but they can also be a problem. Maintaining these devices is crucial to avoid costly repairs and replacements. Most fob problems are caused by a battery issue. The cheapest solution to this problem is to replace the batteries. This can be done at most hardware stores, or even at some big-box stores. Replacement Batteries If you've noticed that your key fob needs several clicks to lock or unlock your car, or if there are other indicators of a low battery, such as an LED