Heated Oxygen Sensor Replacement - Sensor 2

Fig 1: Heated Oxygen Sensor - Sensor 2

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
WARNING: In order to avoid being burned, do not service the exhaust system while it is still hot. Service the system when it is cool. WARNING: Avoid contact with HOT components. Wear safety glasses and protective gloves to avoid personal injury. Preliminary Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle
1	Heated Oxygen Sensor CAUTION: Refer to Component Fastener Tightening Caution . CAUTION: Refer to Heated Oxygen and Oxygen Sensor Caution . CAUTION: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution . CAUTION: The use of excessive force may damage the threads in the exhaust manifold/pipe. Procedure Disconnect the electrical connector. NOTE: The in-line connector and louvered end must be kept clear of grease, dirt or other contaminants. Avoid using cleaning solvents of any type. DO NOT drop or roughly handle the heated oxygen sensor (HO2S). The HO2S may be difficult to remove when the engine temperature is less than 48°C (120°F). A special anti-seize compound is used on the HO2S threads. The compound consists of a liquid graphite and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service sensors will have the compound applied to the threads. If a sensor is removed and is to be reinstalled, the threads must have an anti-seize compound applied before installation. Refer to Adhesives, Fluids, Lubricants, and Sealers Tighten 42 N.m (31 lb ft) Special Tools EN-46577 or J-39194 Oxygen Sensor Wrench Equivalent regional tools: Special Tools (Diagnostic Tools)Special Tools (Mechanical Tools)

Callout

Component Name

WARNING:

In order to avoid being burned, do not service the exhaust system while it is still hot. Service the system when it is cool.

WARNING:

Avoid contact with HOT components. Wear safety glasses and protective gloves to avoid personal injury.

Preliminary Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle

Heated Oxygen Sensor

CAUTION:

Refer to Component Fastener Tightening Caution .

CAUTION:

Refer to Heated Oxygen and Oxygen Sensor Caution .

CAUTION:

Refer to Heated Oxygen Sensor Resistance Learn Reset Caution .

CAUTION:

The use of excessive force may damage the threads in the exhaust manifold/pipe.

Procedure
Disconnect the electrical connector.

NOTE:

The in-line connector and louvered end must be kept clear of grease, dirt or other contaminants. Avoid using cleaning solvents of any type. DO NOT drop or roughly handle the heated oxygen sensor (HO2S).
The HO2S may be difficult to remove when the engine temperature is less than 48°C (120°F).
A special anti-seize compound is used on the HO2S threads. The compound consists of a liquid graphite and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service sensors will have the compound applied to the threads. If a sensor is removed and is to be reinstalled, the threads must have an anti-seize compound applied before installation. Refer to Adhesives, Fluids, Lubricants, and Sealers

Tighten
42 N.m (31 lb ft)
Special Tools
EN-46577 or J-39194 Oxygen Sensor Wrench
Equivalent regional tools: Special Tools (Diagnostic Tools)Special Tools (Mechanical Tools)