Hello, to change the O2 sensor follow this steps:
1. Set the parking brake if the engine has been run recently, let it cool for a few hours before you start.
2. Raise the vehicle with a hydraulic jack and place the jack stand under your trackers frame to supports its weight. Lower the hydraulic jack and set it aside.
3. Craw under the engine on the right hand side(drivers side) near the driver's door. Locate the catalytic converter, which is mounted in-line with the exhaust pipe.
4. Locate the oxygen sensor which is mounted in the exhaust pipe near the rear of the catalytic converter.
5. Remove the wiring harness connector from the oxygen sensor by squeezing in the connector tab with your finger while simultaneously pulling the connector from the sensor.
6. Remove the sensor from the exhaust pipe by turning it out with an adjustable wrench in a counter clockwise direction.
Thanks
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