GM 12590790 Sensor Assembly, Heated Oxygen (Position 1)

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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.

When servicing an oxygen sensor, it is important to exercise caution. Oxygen sensors have a permanently attached pigtail and electrical connector that should not be damaged or removed, as this will render the sensor useless. It is crucial to keep grease, dirt, and other contaminants away from the electrical connector and the louvered end of the sensor. Cleaning solvents should not be used on an oxygen sensor, as they can cause damage. Additionally, oxygen sensors are delicate and should not be dropped or handled roughly. During installation, 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. When removing the upstream oxygen sensor, the engine cover may need to be removed for certain models, while for others, the vehicle should be raised and securely supported on jackstands. The upstream oxygen sensor electrical connector should be disconnected and unclipped from any retainers before removing the sensor. The installation process is the reverse of removal, and it is important to tighten the oxygen sensor securely. For the downstream oxygen sensor, the vehicle should be raised and supported on jackstands, and the electrical connector should be disconnected before unscrewing the sensor. The installation process for the downstream sensor is the same as the upstream sensor, with the application of an anti-seize compound if necessary and ensuring a secure tightening of the sensor.