GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 LaCrosse 🢒 Preface 🢒 Dangers, Warnings, and Cautions 🢒 Knock Sensor 1 Replacement

Removal Procedure

    Warning: Hot engine coolant may cause severe burns. Although the cooling system has been drained, coolant still remains in the engine water jacket. This coolant will drain with the removal of the knock sensor.

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

    2. Object Number: 892627 Size: SH
  2. Drain the cooling system. Refer to Cooling System Draining and Filling.
  3. Disconnect the knock sensor electrical connector (2).
  4. Remove the knock sensor (1).

Installation Procedure

    Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 892627 Size: SH

    Note: DO NOT apply thread sealant to sensor threads. The sensor is coated at factory and applying additional sealant will affect the sensors ability to detect detonation.

  1. Install the knock sensor (1).

    2. Tighten
    Tighten the knock sensor to 19 N·m (14 lb ft).

  2. Connect the knock sensor electrical connector (2).
  3. Lower the vehicle.
  4. Fill the cooling system. Refer to Cooling System Draining and Filling.