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How to Avoid Key Fob Replacement Costs Key fobs are useful but they can also be a source of trouble. It's important to maintain these devices to avoid costly repairs or replacements. Most of the problems with fobs are caused by a battery issue. If is the case, the best and cost-effective solution is to replace the batteries. This can be done at the majority of hardware stores or even some big-box stores. Replacement Batteries If you've noticed that your key fob needs several clicks