Owner's Manual
Page 151
... same cylinder. Cylinders No. 1, 2 and 3 have a P suffix. Cylinders No. 4, 5 and 6 have a PG suffix. If a spark plug needs to Vehicle Emissions Control Information (VECI) decal for spark plug and gap information. ** If a spark plug is removed for inspection, it must be replaced, use only spark plugs with the service part number suffix letter PP as shown on the engine decal...
... same cylinder. Cylinders No. 1, 2 and 3 have a P suffix. Cylinders No. 4, 5 and 6 have a PG suffix. If a spark plug needs to Vehicle Emissions Control Information (VECI) decal for spark plug and gap information. ** If a spark plug is removed for inspection, it must be replaced, use only spark plugs with the service part number suffix letter PP as shown on the engine decal...