GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 Lucerne 🢒 Engine 🢒 Engine Controls and Fuel - 4.6L 🢒 Mass Airflow Sensor with Intake Air Temperature Sensor Replacement

Removal Procedure

Caution: 

   • Handle the MAF sensor carefully.
   • Do not drop the MAF sensor in order to prevent damage to the MAF sensor.
   • Do not damage the screen located on the air inlet end of the MAF.
   • Do not touch the sensing elements.
   • Do not allow solvents and lubricants to come in contact with the sensing elements.
   • Use a small amount of a soap based solution in order to aid in the installation.


    Object Number: 1670786 Size: SH
  1. Disconnect the engine harness electrical connector from the mass air flow/intake air temperature (MAF/IAT) sensor.

    2. Object Number: 1670790 Size: SH
  2. Loosen the air cleaner outlet duct clamp at the throttle body.

    3. Object Number: 1670799 Size: SH
  3. Loosen the air cleaner outlet duct clamp at the MAF/IAT sensor.
  4. Remove the air cleaner outlet duct.

    5. Object Number: 1670874 Size: SH
  5. Remove the MAF/IAT sensor bolts.
  6. Remove the MAF/IAT sensor.

Installation Procedure

Caution: 

   • Handle the MAF sensor carefully.
   • Do not drop the MAF sensor in order to prevent damage to the MAF sensor.
   • Do not damage the screen located on the air inlet end of the MAF.
   • Do not touch the sensing elements.
   • Do not allow solvents and lubricants to come in contact with the sensing elements.
   • Use a small amount of a soap based solution in order to aid in the installation.


    Object Number: 1670874 Size: SH
  1. Install the MAF/IAT sensor.

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

  2. Install the MAF/IAT sensor bolts.

    3. Tighten
    Tighten the bolts to 4 N·m (35 lb in).


    Object Number: 1670799 Size: SH
  3. Install the air cleaner outlet duct.
  4. Tighten the air cleaner outlet duct clamp at the MAF/IAT sensor.

    5. Tighten
    Tighten the clamp to 4 N·m (35 lb in).


    Object Number: 1670790 Size: SH
  5. Tighten the air cleaner outlet duct clamp at the throttle body.

    6. Tighten
    Tighten the clamp to 4 N·m (35 lb in).


    Object Number: 1670786 Size: SH
  6. Connect the engine harness electrical connector to the MAF/IAT sensor.