GMC 12612430 Sensor Assembly, Heated Oxygen (Position 2, Post, Converter)

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Oxygen sensors in the exhaust manifold can be hard to loosen when cold. To avoid damage, run the engine briefly before shutting it off, but avoid burns. When servicing, handle the sensor carefully, avoid damaging the attached pigtail and connector, and keep contaminants away. Don't use cleaning solvents and ensure the silicone boot is correctly positioned. To replace, note there are four sensors; one in each manifold and one after each catalytic converter. For upstream sensors, remove the engine cover, disconnect the connector, remove the sensor, apply anti-seize compound to threads if reusing, and install securely. For downstream sensors, raise the vehicle, disconnect the sensor, unscrew it, apply anti-seize if reusing, and install securely.

When servicing an oxygen sensor, you should be careful not to damage or remove the permanently attached pigtail and electrical connector. It is important to keep contaminants away from the electrical connector and the louvered end of the sensor. Avoid using cleaning solvents and handle the sensor delicately. Ensure that the silicone boot is correctly positioned to prevent melting and incorrect operation.

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.

When servicing an oxygen sensor, you should be careful not to damage or remove the permanently attached pigtail and electrical connector. It is important to keep contaminants away from the electrical connector and the louvered end of the sensor. Avoid using cleaning solvents and handle the sensor delicately. Ensure that the silicone boot is correctly positioned to prevent melting and incorrect operation.

Grease, dirt, and other contaminants should be kept away from the electrical connector and the louvered end of the sensor. Cleaning solvents should not be used as they can cause damage.

THERES 4 02 SENSORS ALL THE SAME PART# 12612430 PER VIN#