The oxygen sensor on an Audi A4 generally lasts anywhere from 60,000 to 75,000 miles, and when it goes out, it should be replaced as soon as possible. Otherwise, your car will run poorly, the gas mileage will suffer, and you risk doing permanent damage to the vehicle. Fortunately, this is an easy task to do at home with just a few tools, and shouldn't take more than an hour to accomplish. In this case, the project vehicle is a 2001 Audi A4 with the 3.2L engine.
- Skill level:
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Things you need
- Jack stands
- Oxygen sensor socket
- 3/8-inch ratchet and socket set
- Anti-seize compound
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 louvres 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.
Tips and warnings
- Remember to allow the exhaust to cool before working on the vehicle; otherwise, you risk burning yourself.
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