Hummer H2. Manual — part 1439

Tighten: Tighten the sensor to 42 N.m (31 lb ft).

3. Connect the HO2S harness connector (1).

4. Lower the vehicle.

HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 2 SENSOR 2

Tools Required

J 39194-B Oxygen Sensor Wrench. See Special Tools and Equipment .

Removal Procedure

1. Raise the vehicle.

CAUTION: Refer to Vehicle Lifting Caution in Cautions and Notices.

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2

Fig. 52: Locating O2 Sensor
Courtesy of GENERAL MOTORS CORP.

2. Disconnect the connector (1) for the HO2S.

3. Remove the HO2S (2) using a J 39194-B . See Special Tools and Equipment .

NOTE:

Refer to Heated Oxygen and Oxygen Sensor Notice in Cautions and
Notices.

NOTE:

Refer to Excessive Force and Oxygen Sensor Notice in Cautions and
Notices.

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2

Installation Procedure

1. Coat the threads of the oxygen sensor with anti-seize compound GM P/N 5613695, if necessary.

IMPORTANT: A special anti-seize compound is used on the heated oxygen sensor

(HO2S) threads. The compound consists of liquid graphite and glass
beads. The graphite tends to burn away, but the glass beads remain,
making the sensor easier to remove. New, or service replacement sensors
already have the compound applied to the threads. If the sensor is
removed from an engine and if for any reason the sensor is to be
reinstalled, the threads must have anti-seize compound applied before the
reinstallation.

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2

Fig. 53: Locating O2 Sensor
Courtesy of GENERAL MOTORS CORP.

2. Install the HO2S (2) using a J 39194-B . See Special Tools and Equipment .

Tighten: Tighten the sensor to 42 N.m (31 lb ft).

3. Connect the HO2S harness connector (1).

4. Lower the vehicle.

ACCELERATOR PEDAL POSITION (APP) SENSOR REPLACEMENT

Removal Procedure

1. Remove the left instrument panel (I/P) lower closeout insulator panel.

2. Disconnect the accelerator pedal position (APP) sensor harness connector.

NOTE:

Refer to Component Fastener Tightening Notice in Cautions and Notices.

NOTE:

Handle the electronic throttle control components carefully. Use
cleanliness in order to prevent damage. Do not drop the electronic throttle
control components. Do not roughly handle the electronic throttle control
components. Do not immerse the electronic throttle control components in
cleaning solvents of any type.

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2