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Why You Should Have a Car Spare Key It's always a good idea to have a spare key. It helps prevent lockouts, and can save you money in the long run. It also lets you switch between keys frequently, preventing any wear and tear to the original key. The best place to store your spare key is in the possession of a family member or friend who you can trust to bring it in an emergency. Peace of Mind A spare key can give you peace of mind knowing you'll have a backup in case you get locked out of the car.