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Why You Should Have a Spare Key For Your Car It is costly to have new keys if you have lost them. This is especially applicable to laser-cut keys that require a special machine generally only available at dealerships to reprogramme. If you accidentally lock yourself out, having an extra key in your wallet, or giving it to a trusted friend could aid. The person who has it can take you to your vehicle or to your home to retrieve the spare key. 1. You can save time A spare key for you