Heated Oxygen Sensor Replacement - Sensor 1

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. Preliminary Procedure Disconnect battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
1	Heated Oxygen Sensor 1 CAUTION: Refer to Component Fastener Tightening Caution . Procedure Remove the wiring harness from retainer clip. Disconnect electrical connector. After replacement of the heated oxygen sensor, use a scan tool to speed up learn functions. Refer to K20 Engine Control Module: Programming and Setup . NOTE: A special anti-seize compound is used on 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 old sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation. Refer to Adhesives, Fluids, Lubricants, and Sealers . Perform the HO2S heater resistance learned values reset. HO2S Heater Resistance Learned Values Reset Tighten 42 N.m (31 lb ft) Special Tools EN-48259 Installer/Remover For equivalent regional tools, refer to Special Tools (Diagnostic 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.

Preliminary Procedure Disconnect battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .

Heated Oxygen Sensor 1

CAUTION:

Procedure

Remove the wiring harness from retainer clip.
Disconnect electrical connector.
After replacement of the heated oxygen sensor, use a scan tool to speed up learn functions. Refer to K20 Engine Control Module: Programming and Setup .
NOTE:
A special anti-seize compound is used on 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 old sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation. Refer to Adhesives, Fluids, Lubricants, and Sealers .
Perform the HO2S heater resistance learned values reset. HO2S Heater Resistance Learned Values Reset

Tighten
42 N.m (31 lb ft)
Special Tools
EN-48259 Installer/Remover
For equivalent regional tools, refer to Special Tools (Diagnostic Tools)