Knock Sensor Replacement for Chevrolet TrailBlazer - 2WD 2009

1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle.



2. Remove the knock sensor harness connector (4).
3. Remove the knock sensor retaining bolt (3).
4. Remove the appropriate knock sensor (1 or 2).

Caution: Refer to Component Fastener Tightening Caution in the Preface section.




1. Install the knock sensor (1 or 2) and the bolt (3). Tighten the sensor to 25 N·m (18 lb ft).
2. Connect the knock sensor harness connector (4).
3. Lower the vehicle.