The way to Clean the Oxygen Sensors inside a Lexus SC400

Raise the vehicle using a hydraulic jack and secure it on jack stands. The Lexus SC400 is equipped with four oxygen sensors, two per bank. Stick to the exhaust manifolds in the front on the engine to underneath it where you may see the oxygen sensors screwed into position, each just before and following the catalytic converters on each and every side on the engine . The oxygen sensors will have wires plugged into the top rated on the sensors that run back into the engine bay.

Spray the oxygen sensors with penetrating oil and make it possible for it to sit for a minimum of ten minutes. On a high mileage automobile, this procedure should be repeated several instances.

Use a box-end wrench or oxygen removal socket to remove the sensor for cleaning. If the "Check Engine" light on your Lexus SC400 has come on, the code will tell you which sensor is not operating normally. Otherwise, clean all 4 oxygen sensors so that the engine's computer signal remains consistent.

Examine the oxygen sensor to make sure the contact is intact and has not cracked, broken off or been damaged. The sensor contact will be black and covered with carbon; but if it is damaged, it will need to be replaced.

Spray the oxygen sensor with throttle body cleaner. Let it to soak in then gently tap the end from the oxygen sensor to dislodge any deposits. Repeat, as necessary, until the sensor is clean.

Reinstall the oxygen sensor once it is dry and cleaned. Lower the car with the hydraulic jack. You may want to place a dab of anti-seize compound on the threads on the oxygen sensor so that it is easier to remove in the future.