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How to Program a Key The majority of the new keys for modern vehicles need to be programmed to function. can be accomplished by a parts department of a dealer or a professional locksmith with the correct tools. Key programming is needed in two scenarios in which an additional key is added, or when all the keys that work are lost. Each of these steps differs slightly, but can be broken down into three categories: Keys In data structures, the key is an identifier that uniquely identifies an entire set of data. The key may be part of the data (as as pr