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How do I Replace an S80 Oxygen Sensor

The job of your Volvo S80s oxygen sensor is to regulate the fuel and air ratio in your car. It also controls your gas mileage. If the oxygen sensor malfunctions, your S80 will run poorly, and its gas mileage will decline. With a few tools, most people can replace the oxygen sensor safely.

Instructions

1

Locate the oxygen sensor on your pre-catalytic converter. It is near the right front wheel well of your S80.

2

Detach the two small air intake pipes by hand from the air box and from the blowoff valves. Twist off the large air intake pipe as well from the air box and the rear turbo. This provides access to the oxygen sensor. Spray WD-40 over the existing oxygen sensor to make it easier to remove.

3

Use the 7/8-inch wrench to remove the failed sensor. Locate the stock sensor wire near the engine lift loop near your engines firewall. Connect the ends of the stock sensor wire to the new oxygen sensors wires using the crimp connectors.

4

Rub a small amount of anti-seize paste onto the new oxygen sensor threads. Do not get any paste on the sensor itself, because that could cause it to fail. The paste will make removal easier the next time.

5

Screw in the new oxygen sensor, and tighten it enough with the wrench that it cannot be loosened easily. Reattach the air pipes to the valves.