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How to Program a Key Most new keys for modern vehicles need to be programmed prior to their function. This can be accomplished in a parts department of a dealership or a locksmith with the right tools. Key programming is required in two scenarios in which an additional key is added, or when all of the working keys are lost. Each of these steps is different, but can be divided into three categories: Keys In data structures, a key is an identifier that is unique to the data set. Sometimes the key is part of the data itself (a