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Is It Time to Get a Replacement For Key Fob? The majority of new cars use a single key fob that can unlock and start the engine. Certain key fobs can also be used for additional tasks like auto-parking or rolling down the windows. Fobs are typically available only at the dealership since they require sophisticated programming equipment exclusive to the manufacturer. Utilizing a fob from an aftermarket retailer could result in operational issues or security risk, according to experts.