To replace an oxygen sensor, loosen the sensor with a specially designed wrench, and enlist the help of a breaker bar to remove the sensor entirely. You need a high-quality penetrant spray, an oxygen sensor wrench, a breaker bar and a screw-type oxygen sensor.
- Consult your repair manual
Consult the repair manual for the vehicle to determine whether you have a screw-in or welded-in type of oxygen sensor. Do not attempt to replace the sensor yourself if it has a welded-in style.
- Apply the penetrant
Spray the penetrant over the oxygen sensor where it comes loose.
- Slide on the wrench
Slide the specialized wrench over the sensor.
- Loosen the sensor
Insert the end of a breaker bar into the notch on the wrench. Twist the bar until the sensor loosens, and then disconnect the wires to remove it.
- Install the new sensor
Install the new sensor in the same way as the old, and use your hand to tighten it most of the way.
- Secure the sensor
Use the wrench to secure the sensor the rest of the way, and then connect the wires to the new sensor.
- Reset the engine light
If a faulty oxygen sensor caused the Check Engine light to illuminate, reset the light.