Three (3) different unique styles of platinum enhanced spark plugs are produced for vehicles with Electronic Ignition (EI). Each style is distinguished by their part number suffix letters.
The suffix letter "P" indicates the center electrode is enhanced with platinum.
The suffix letter "PG" indicates the ground (side) electrode is enhanced with platinum.
The suffix letter "PP" indicates double platinum enhancement on both the ground (side) and center electrode.
If a spark plug is removed for examination, it must be reinstalled in the same cylinder. If a spark plug needs to be replaced, use only spark plugs with the service part number suffix letter "PP" as shown on the engine decal. Refer to the following Platinum Enhanced Spark Plug Replacement Chart for correct parts usage.