ITEM NAME:2 Pack Engine Knock Sensor for Chevy GMC Silverado Camaro Isuzu Part Number Z2T9 2 Pack Engine Knock Sensor for Chevy GMC Silverado Camaro Isuzu Part Number Z2T9 Engine knock detonation sensor reference OE number 10456603,KS116,12589867,8104566030. A knock sensor is like a small electronic microphone that is usually attached to the engine block and listens for a couple of things that a engine might do. This Engine Knock Sensor kit makes a great replacement and has good cost savings over a dealer set. Screw-in mounting type engine knock detonation sensor. Specification:Surface finish: Machine ;