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