Set of 2 OEM Knock Sensor Factory Part No 12570125. Other names: Ignition Knock (Detonation) Sensor Fits multiple vehicle applications: from 2004-2020, Saturn, Pontiac, GMC, Chevrolet, Buick, Cadillac and Hummer models. Current OEM factory part number: 12570125 Supersession(s): 12623730, 2131576 New Surplus OEM, may not be in original packaging