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How to Use Automotive Keys Properly There are many different styles of keys for cars. Some include transponder chips in their heads, whereas others are flat and operate mechanically by utilizing grooves on their tops and bottoms. of the past were easy to duplicate, however later, manufacturers introduced a chip that stored the unique "password" for your car. This adds an extra layer of security against theft. Transponder key A chip key or transponder is a unique key for cars with