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Why You Should Have a Spare Key For Your Car If you lose your keys it could be costly to get a new set created. This is particularly the case for laser-cut keys that require a specific machine, which is usually only available in dealerships, to change the programming. A spare key in your pocket or giving it to someone you trust can help you get out of a lockout that you've made. The person who has it can take you to your car or head to your house to grab the spare key. 1. You will save time A spare