GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 Yukon XL - 4WD 🢒 Engine 🢒 Engine Controls - 8.1L 🢒 Knock Sensor 2 Replacement

Removal Procedure

    Object Number: 750961 Size: SH
  1. Drain the cooling system/engine block. Refer to Cooling System Draining and Filling in Engine Cooling.
  2. Disconnect the knock sensor electrical connector (3).

    3. Object Number: 858222 Size: SH
  3. Remove the knock sensor.

Installation Procedure

    Object Number: 858222 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  1. Install the knock sensor.

    2. Tighten
    Tighten the sensor to 20 N·m (15 lb ft).


    Object Number: 750961 Size: SH
  2. Connect the knock sensor electrical connector (3).
  3. Fill the cooling system/engine block. Refer to Cooling System Draining and Filling in Engine Cooling.