GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 Lucerne 🢒 Engine 🢒 Engine Controls and Fuel - 4.6L 🢒 Knock Sensor Replacement

Removal Procedure

    Object Number: 1672557 Size: SH
  1. Remove the intake manifold. Refer to Intake Manifold Replacement.
  2. Disconnect the electrical connector (3) from the right knock sensor, if required.

    3. Object Number: 1672558 Size: SH
  3. Disconnect the electrical connector (2) from the left knock sensor, if required.

    4. Object Number: 1672563 Size: SH
  4. Remove the appropriate knock sensor. Cylinder heads shown removed for clarity.

Installation Procedure

    Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1672563 Size: SH
  1. Install the appropriate knock sensor.

    2. Tighten
    Tighten the sensor to 25 N·m (18 lb ft).


    Object Number: 1672558 Size: SH
  2. Connect the electrical connector (2) to the left knock sensor, if required.

    3. Object Number: 1672557 Size: SH
  3. Connect the electrical connector (3) to the right knock sensor, if required.
  4. Install the intake manifold. Refer to Intake Manifold Replacement.