Changing an O2 sensor helps to observer the pollutants outlook from your exhaust system during development.
The V6 4.3-liter engine of the 2002 Chevrolet Blazer has four O2 sensors that scanner the fuel-to-air ratio and the catalyst efficiency. Locating the equitable O2 sensor or sensors to exchange may be bounteous challenging than de facto replacing them. Grasp in head that the bank one sensor is on the duplicate side as the figure one cylinder, and the two sensors one (1) are on the front tube conscientious below the manifold. The two rear sensors are on the passenger side of the SUV; one placed in front of the catalytic converter and one directly endure it. These are referred to as sensors two (2).
Instructions
1. Operate the 2002 Chevrolet Blazer up onto two vehivle ramps, and then manipulate the parking brake.
2. Accommodation a spin block extreme one of the rear tires.
3. Disconnect the wire harness plug.7. Place the plug of the sensor through the box-end side of the 22-mm or 7/8-inch wrench, and then place the wrench onto the hex-headed portion of the sensor.8.
The two front ones are located in the front Y-pipe of the exhaust method In relation to the front of the engine. There is one per side of the Y-pipe. The other two are located before and after the catalytic converter (which is dependable endure the Y-pipe In relation to the centre of the vehicle on the passenger side).
5. Spray the threads of the oxygen sensor with penetrating lubricant, and remit it to soak in for a unusual minutes.
6. Ensue the wire harness from the oxygen sensor to the plug connection. Use a small forked pry tool to unseat the retaining tab of the plug connection from the frame or undercarriage of the SUV. Place the safety glasses on, and crawl underneath the Blazer with the remaining items.4. Establish the O2 sensor(s) you intend to transform.
Turn the sensor counterclockwise using the wrench. A quick jerking motion of the wrench should loosen the sensor effectively, but if necessary, start the engine for a couple of minutes to warm up the exhaust system and expand the binding metals of the pipe and sensor. Be careful that it will not heat up the front Y-pipe sensors because they can become hot enough to burn you.
9. Thread the new replacement sensor into the exhaust port by hand as far as it will allow. Tighten the sensor to 30-foot pounds with a torquing hand wrench. Do not over-tighten the sensor, or you will damage the threads.
10. Reconnect the wire harness of the replacement sensor to the plug connection, and then push the retaining tab back into its respective hole in the frame or undercarriage.
