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How to Program a Key The majority of new keys for modern cars need to be programmed in order to work. This can be accomplished by a parts department of a dealer or a professional locksmith who has the appropriate tools. Key programming is required in two situations: when an extra key is added, or when all working keys are lost. The steps for each vary slightly however they can be broken down into the following categories: Keys In data structures, a key can be an identifier that is unique to an entire set of data. Sometimes