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How to Change an Oxygen Sensor on a 2002 Chevrolet Blazer 4WD V6

The V6 4.3-liter engine of the 2002 Chevrolet Blazer has four oxygen sensors that monitor the fuel-to-air ratio and the catalyst efficiency. Locating the correct oxygen sensor or sensors to replace may be more challenging than actually replacing them. Keep in mind that the bank one sensor is on the same side as the number one cylinder, and the two sensors one (1) are on the front pipe just 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 behind it. These are referred to as sensors two (2).

Instructions

1

Drive the 2002 Chevrolet Blazer up onto two car ramps, and then apply the parking brake.

2

Place a wheel block behind one of the rear tires.

3

Put the safety glasses on, and crawl underneath the Blazer with the remaining items.

4

Locate the oxygen sensor(s) you intend to replace. The two front ones are located in the front Y-pipe of the exhaust system towards 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 just behind the Y-pipe towards the center of the vehicle on the passenger side).

5

Spray the threads of the oxygen sensor with penetrating lubricant, and allow it to soak in for a few minutes.

6

Follow 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. 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

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.

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