GM 12594452 Sensor,Heated Oxygen(Position 1)

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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.

You should be aware that oxygen sensors can be difficult to loosen when the engine is cold due to contraction. It is recommended to run the engine for a minute or two before shutting it off to avoid damage. Additionally, be careful not to burn yourself during this procedure.