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How to Use Automotive Keys Properly Automotive keys come in a variety of styles. Some of them have transponder chips on their heads, and others are flat and work mechanically through grooves on the tops and bottoms. The first car keys were simple to duplicate, however manufacturers later added a chip that stored a unique"password" for your vehicle. This is an additional layer of protection against theft. Transponder key A transponder, also known as a chip key, is a unique key f