GM 12590790 Sensor Assembly, Heated Oxygen (Position 1)

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When servicing an oxygen sensor, exercise caution. Oxygen sensors have a permanently attached pigtail and electrical connector that should not be damaged or removed. Keep grease, dirt, and contaminants away from the electrical connector and sensor. Avoid using cleaning solvents as they can cause damage. Handle sensors delicately and avoid dropping them. Apply anti-seize compound during installation, unless it's a new sensor with compound already applied. Install the silicone boot correctly to prevent melting. Removing the upstream sensor may require removing the engine cover or raising the vehicle on jackstands. Disconnect the upstream sensor's electrical connector before removal. The installation process is the reverse of removal, ensuring a secure tightening. For the downstream sensor, raise the vehicle on jackstands and disconnect the electrical connector before unscrewing. Installation is the same as the upstream sensor, with optional anti-seize compound and secure tightening.

It is recommended to apply an anti-seize compound to the threads of the sensor for future removal, unless it is a new sensor that already has an anti-seize compound. The silicone boot on the sensor should be installed correctly to prevent melting and ensure proper operation.