- Replacement oxygen sensors (2)
- Socket set
- Wrench set
- Oxygen sensor wrench
- Pliers
- Jack and jack stands
- Safety glasses
- Gloves
2. Prepare your vehicle.
- Park your vehicle on a level surface and apply the parking brake.
- Turn off the engine and allow it to cool down.
- If you are working with a front-wheel drive vehicle, you may need to remove the front wheels.
- Raise your vehicle using a jack and jack stands.
- WARNING: Ensure the vehicle is adequately secured on the jack stands before crawling underneath.
3. Locate the oxygen sensors.
- The oxygen sensors are located on the exhaust manifold or exhaust pipe, one before the catalytic converter and one after.
- The sensors are typically screwed into the exhaust pipe with a single bolt.
4. Disconnect the oxygen sensor harnesses.
- Use a wrench to loosen the bolt holding the oxygen sensor harness to the sensor.
- Disconnect the harness by pulling it straight off of the sensor.
5. Remove the oxygen sensors.
- Use an oxygen sensor wrench to loosen the oxygen sensor from the exhaust pipe.
- Be careful not to damage the threads of the exhaust pipe.
- Once the oxygen sensor is loose, you can remove it by hand.
6. Install the new oxygen sensors.
- Screw the new oxygen sensors into the exhaust pipe by hand.
- Tighten the oxygen sensors with an oxygen sensor wrench until they are snug.
- WARNING: Do not overtighten the oxygen sensors, as this can damage the threads of the exhaust pipe.
7. Reconnect the oxygen sensor harnesses.
- Plug the oxygen sensor harnesses back into the sensors.
- Tighten the bolts holding the harnesses to the sensors.
8. Lower your vehicle.
- Slowly lower your vehicle off of the jack stands.
- Remove the jack and jack stands.
9. Test the oxygen sensors.
- Start your vehicle and let it run for a few minutes.
- Check the oxygen sensor readings with an OBD-II scanner.
- The oxygen sensor readings should be between 0 and 1 volts.
10. Enjoy your newly installed oxygen sensors!
Your Buick Roadmaster should now be running more efficiently and with fewer emissions.
