How to Install an Oxygen Sensor in Vehicles

by Contributing Writer; Updated June 12, 2017

The Vehicles has two oxygen sensors. One will always be located forward of the catalytic converter and one behind. The forward sensor signals the free oxygen in the system relative to the fuel mixture. It also is used Vehicles a comparison of the trailing sensor behind the converter. There should be significantly fewer counts on the rear sensor than the front, indicating that the converter is working. When the counts are close to the same, that means that what goes into the converter comes out unchanged. A code scanner is the only way to determine which sensor is malfunctioning.

Under The Hood:

 How to Install an Oxygen Sensor in a Suzuki Swift

Place a small amount of anti-seize onto the threads of the oxygen sensor.

Insert the sensor into the area designated for the O2 sensor. This will be on the exhaust pipe where the old O2 sensor was located. Depending on the year of your Suzuki Swift, you'll find this above or below the the catalytic converter.

Place the end of the O2 socket extension onto the O2 bung and begin tightening the sensor by turning it clockwise.

Plug the electrical connectors into the oxygen sensor's bung/housing. These wires are necessary to send the information to the Suzuki Swift ECU.

Turn on the vehicle and verify that the "check engine" light does not stay on. If you installed the oxygen sensor on your Suzuki Swift correctly, the "check engine" light will come on when you first start the vehicle, and then it will go out after a few seconds. This indicates that there are no malfunctions with any components - including the one you just installed.

Items you will need

  • Oxygen sensor Anti-seize O2 socket extension

 How to Install an Oxygen Sensor in a Volvo

Place a small amount of anti-seize on the threads of the O2 sensor.

Unscrew the old O2 sensor, located in front of or behind the catalytic converter, depending on the year of the Volvo. Place the new O2 sensor into the threaded hole.

Tighten the O2 sensor until you feel resistance. Do not force the O2 sensor into place or damage may occur to the threads on either the O2 sensor itself or the hole in the piping.

Connect the electrical connector to the O2 bung.

Verify that the sensor is functioning properly by turning on the vehicle. Wait for the "check engine" light to come on, then wait for it to turn off. If the "check engine" light cycles properly and does not come back on again after it goes out, the O2 sensor is functioning properly.

Items you will need

  • New O2 sensor Anti-seize compound O2 installation/removal tool with socket wrench

 How to Install an Oxygen Sensor in an Audi A4

Raise the vehicle up in the air using the jack and secure it on jack stands. Double-check that the vehicle is secure before crawling underneath it.

Lay down on your back and slide underneath the vehicle. Locate the catalytic converter on the exhaust, which is close to the engine compartment and has large heat shields above and below it. They also have small louvers and holes in them. Just behind the catalytic converter is a small tube that protrudes perpendicular to the tubing, and has a small wiring harness coming out of it. Unplug that harness with your hands.

Unbolt the oxygen sensor from the exhaust using the oxygen sensor socket and the 3/8-inch ratchet. Once it's out, discard it.

Coat the threads on the replacement sensor with the anti-seize compound, making sure not to get it on the sensor body itself. Thread the replacement sensor into the bung on the exhaust by hand, then use the oxygen sensor socket and the ratchet to secure it in place. Clip the harness on the replacement sensor into the stock harness using your hands.

Drop the car off the jack stands using the jack.

Items you will need

  • Jack

  • Jack stands

  • Oxygen sensor socket

  • 3/8-inch ratchet and socket set

  • Anti-seize compound

 How to Install an Oxygen Sensor on a Ford Truck

Park your truck in a safe and level place. Open the hood and disconnect the black, negative cable from the battery. Place the transmission in neutral and release the parking brake.

Raise the front of the truck using a floor jack and support it safely on jack stands. Place the transmission in park (automatic) or gear (manual). Apply the parking brake and block the rear wheels.

Locate the front or rear heated oxygen sensor--whichever you need to replace--under the truck. It will be easier if you follow the front exhaust pipe coming out of the exhaust manifold. The front sensor is threaded into the exhaust pipe just before it connects to the catalytic converter; the rear sensor is threaded into the back pipe right after the catalytic converter. Heated oxygen sensors come with three wires. If yours is a different type, it will have one or two wires. The component is similar to a spark plug.

Unplug the oxygen sensor's electrical connector.

Remove the sensor using a sensor socket and ratchet.

Install the new unit by hand first to avoid damage to the threads. Then use a torque wrench and sensor socket for final adjustments. Torque the sensor to 36 ft.-lbs. (46 Nm).

Plug the oxygen sensor electrical connector. Lower the vehicle and connect the black, negative cable to the battery.

Items you will need

  • Floor jack

  • 2 jack stands

  • Ratchet and sensor socket

  • Heated sensor

  • Torque wrench

 How to Install an Oxygen Sensor in a 2005 Ford Expedition

Plug the code scanner into the OBS port on the lower left side of the steering column below the dash. Turn the ignition key to the “On” position without starting the engine.

Press the “Read” key on the code scanner, which interrogates the computer for failure codes and displays them on the scanner. These codes are faults in the electrical elements under the control of the computer, exclusive of mechanical aspects. The codes are displayed as a letter followed by four numbers. The letter designates the computer control quadrant and the numbers represent specific failure descriptions.

Record this code and cross-reference it with the code sheet that accompanies the scanner. Here is an example of an oxygen sensor code: 02 (oxygen sensor) – B1 (bank 1) – S2 (sensor number 2 or behind the converter). Bank 1 is displayed even on 4 cylinder engines though there is only 1 bank. On all others such as V6 or V8 engines, bank 1 relates to the side of the engine where the number 1 cylinder is located.

Raise and support the truck on jack stands. Locate the indicated sensor. Disconnect the electrical harness connector. Remove the oxygen sensor, using the 7/8-inch wrench.

Spread anti-seize compound on the threads on the new sensor. Screw the sensor in, and tighten the sensor with the wrench. Turn the ignition key on. Press the “Erase” key on the code scanner to turn off the check engine light and reset the computer.

Items you will need

  • Code scanner

  • 7/8-inch wrench

  • Floor jack

  • Jack stands