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If you are speaking of a key for a recent model vehicle ( 97 model or newer ), the so-called "code" you are speaking of stands for PLASTIC TRANSPONDER. Some keys will have PHT written on the key in the same fashion.....meaning PLASTIC-HEAD TRANSPONDER. Of course, the PLASTIC (P) or PLASTIC-HEAD (PH) refers to the upper ergonomic portion of the key. The TRANSPONDER (T) stands for the programmable "chip" inside of the key, which leaves your vehicle immobilized if NOT programmed or NOT present at the time of ignition.

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Q: Wikipedia what is key code PT on keys?
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