GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 LaCrosse 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Knock Sensor Replacement

Removal Procedure

    Object Number: 1554554 Size: SH
  1. Drain the cooling system. Refer to Cooling System Draining and Filling.
  2. Disconnect the left knock sensor electrical connector, if required.

    3. Object Number: 1551881 Size: SH
  3. Remove the left knock sensor bolt, if required.
  4. Remove the left knock sensor, if required.

    5. Object Number: 1554552 Size: SH
  5. Disconnect the right knock sensor electrical connector (2), if required.

    6. Object Number: 1551882 Size: SH
  6. Remove the right knock sensor bolt, if required.
  7. Remove the right knock sensor, if required.

Installation Procedure

    Object Number: 1551882 Size: SH
  1. Position the right knock sensor to the engine block, if required.

    2. Caution: Refer to Fastener Caution in the Preface section.

  2. Install the right knock sensor bolt, if required.

    3. Tighten
    Tighten the bolt to 20 N·m (15 lb ft).


    Object Number: 1554552 Size: SH
  3. Connect the right knock sensor electrical connector (2), if required.

    4. Object Number: 1551881 Size: SH
  4. Position the left knock sensor to the engine block, if required.
  5. Install the left knock sensor bolt, if required.

    6. Tighten
    Tighten the bolt to 20 N·m (15 lb ft).


    Object Number: 1554554 Size: SH
  6. Connect the left knock sensor electrical connector, if required.
  7. Fill the cooling system. Refer to Cooling System Draining and Filling.