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How to Program a Key The majority of new keys for modern cars need to be programmed to function. This can be accomplished by a dealer's parts department or a professional locksmith with the correct tools. Key programming is needed in two situations in which an additional key is added, or when all working keys are lost. The steps for each differ slightly however they can be broken into the following categories: Keys In data structures, a key is an identifier that is unique to the data set. The key can be part of the data (as