GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 Envoy - 4WD 🢒 Engine 🢒 Engine Controls and Fuel - 4.2L 🢒 Knock Sensor Replacement

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

    2. Object Number: 727528 Size: SH
  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).

Installation Procedure

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


    Object Number: 727528 Size: SH
  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.