There are a variety of components in the emission control system of modern automobiles, one of which is the Oxygen (O2) sensor.GM Tech2 It measures the amount of oxygen present in the engine exhaust. The O2 sensor is linked to the Lexus SC400's computer, which then makes adjustments to the fuel/air mixture as the engine is running. This helps the engine run at peak efficiency, reducing exhaust pollution. The O2 sensor requires periodic replacement. Many owners can do the job themselves.
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Park your Lexus SC400. Set the parking brake, and open the engine hood. Let the engine cool completely before proceeding.

Locate the O2 sensor.MB SD compact 4 It's in the lower engine area on the passenger side, threaded into the exhaust manifold.
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Remove the wire from the sensor. Spray some anti-seize spray at the bottom of the sensor where it goes into the manifold. Let the fluid penetrate for a few minutes before proceeding.

Remove the sensor with the appropriate size socket and ratchet.Vagcom 16.8 Rotate the sensor counter-clockwise to loosen.

Install the new sensor into the hole and tighten firmly. Attach the wire and the job is finished.