Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (LF3)

Fig 1: Heated Oxygen Sensor - Bank 1 Sensor 1 (LF3)

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
Preliminary Procedures Remove the drivetrain and front suspension frame. Refer to Drivetrain and Front Suspension Frame Replacement .
1	Heated Oxygen Sensor CAUTION: Refer to Heated Oxygen and Oxygen Sensor Caution . CAUTION: Refer to Component Fastener Tightening Caution . Procedure Disconnect the heated oxygen sensor harness connector. If reinstalling the old sensor, coat the threads with anti-seize compound. Refer to Adhesives, Fluids, Lubricants, and Sealers . NOTE: A special anti-seize compound is used in the 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 exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before reinstallation. Tighten 42 N.m (31 lb ft)

Callout

Component Name

Preliminary Procedures
Remove the drivetrain and front suspension frame. Refer to Drivetrain and Front Suspension Frame Replacement .

Heated Oxygen Sensor

CAUTION:

Refer to Heated Oxygen and Oxygen Sensor Caution .

CAUTION:

Refer to Component Fastener Tightening Caution .

Procedure

Disconnect the heated oxygen sensor harness connector.
If reinstalling the old sensor, coat the threads with anti-seize compound. Refer to Adhesives, Fluids, Lubricants, and Sealers .

NOTE:

A special anti-seize compound is used in the 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 exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before reinstallation.

Tighten
42 N.m (31 lb ft)