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How to Use Automotive Keys Properly There are many different styles of automotive keys. Some include transponder chips in their heads, while others are flat and function mechanically through grooves on the tops and bottoms. Car keys of the past were simple to duplicate, but later, manufacturers introduced chips that could store a unique "password" for your vehicle. This is an extra layer of security against theft. Transponder key A transponder, also known as a chip key, is a special key for c