Question about 2003 Lexus SC 430
Its screwed into the exhaust before the catalytic convertor.Unplug the electrical plug and use ring spanner or appropriate socket to remove,easier and safer if cold.spray base of sensor a few hours before removal with crc.Nothing dificult about this job.Once replaced allow enough time for ECU to acknowledge and adapt to new sensor.
Posted on Nov 02, 2008
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Posted on Jan 02, 2017
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Raise the front of your Intrepid with a jack and support the car with a set of jack stands positioned under the frame. Remove the jack from under the car and out of the way for now.
Locate the oxygen sensor from under the car. Looking up into the engine compartment--the sensor is on the outboard side of the exhaust manifold pointing out toward the fender. This location is the same for both oxygen sensors, just on opposite sides of the car.
Locate the wiring harness connector by following the wiring pigtail from the sensor down the wires until you see the connector. Lift the locking tab slightly on the connector and separate the two halves of the connector. Lay the wires aside and return to the oxygen sensor.
Turn the oxygen sensor counter-clockwise with an oxygen sensor socket and ratchet until it is loose, then remove it from the exhaust pipe. Discard the old sensor and thread the new oxygen sensor into the exhaust pipe by hand to start with. This will help avoid cross threading the sensor and exhaust pipe.
Tighten the oxygen sensor to 20 ft.lbs. with a torque wrench and oxygen sensor socket. Plug the wiring pigtail from the new sensor into the wiring harness connector on the car. Push the two halves together until the locking tab engages and the halves are secure.
Repeat the process for the other sensor if you are changing both. Raise the front of your Intrepid off the jack stands with a jack, remove the stands from under the car and lower the car to the ground.
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