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How to Program a Key The majority of modern keys for vehicles need to be programmed before they will work. This can be done by a dealer's parts department or a professional locksmith using the appropriate tools. There are two situations where the programming of keys is needed in the shop: adding an extra key or the keys that work are gone. Each of these steps differs slightly however, they can be divided into three categories: Keys In data structures, a key is an identifier that is unique to t