Preparation

1. Gather Necessary Tools and Materials

• Socket wrench set
• Oxygen sensor socket
• Penetrating oil
• Replacement oxygen sensor compatible with a 2016 Toyota RAV4
• Jack and jack stands
• Safety goggles and gloves

1. Ensure Safety

• Make sure the car is parked on a flat surface.
• Allow the engine to cool down to prevent burns from hot engine parts or the exhaust system.

1. Identify the Faulty Sensor

• Use an OBD-II scanner to identify which oxygen sensor is faulty. The scanner will provide a code indicating which sensor needs to be replaced. There are typically two types: upstream (pre-catalytic converter) and downstream (post-catalytic converter).

Remove the Faulty Oxygen Sensor

1. Lift the Vehicle

• Safely raise the vehicle using a jack and support it with jack stands. Ensure stability before working underneath the car.

1. Locate the Oxygen Sensor

• Depending on the OBD-II scanner results, locate the necessary oxygen sensor. It will be screwed into the car's exhaust pipe, either before or after the catalytic converter.

1. Apply Penetrating Oil

• Spray penetrating oil around the base of the sensor where it connects to the exhaust pipe. This will help loosen any rust and make removal easier. Allow the oil to sit for a few minutes.

1. Disconnect the Sensor Wire

• Follow the sensor wire to its connector and disconnect it carefully to avoid damage.

1. Remove the Sensor

• Use an oxygen sensor socket and a ratchet to loosen and remove the faulty sensor. Turn counter-clockwise to unscrew.

Install the New Oxygen Sensor

1. Prepare the New Sensor

• If necessary, apply anti-seize compound sparingly to the threads of the new oxygen sensor. Avoid getting the compound on the sensor tip.

1. Install the New Sensor

• Position the new sensor into the exhaust pipe and hand-tighten it to avoid cross-threading. Then, use an oxygen sensor socket and a ratchet to tighten it securely.

1. Reconnect Sensor Wire

• Plug the sensor wire into the appropriate connector. Ensure the connection is secure and properly aligned.

1. Check and Clear Error Codes

• Lower the vehicle from the jack stands using the jack.
• Turn on the vehicle and use the OBD-II scanner to check that the error code has been cleared. If not cleared automatically, you may need to clear it manually using the scanner.

Final Checks and Test

1. Perform a Test Drive

• Take the vehicle for a test drive to ensure that the new oxygen sensor is working correctly and that the engine light remains off.

1. Monitor for Any Issues

• After driving, recheck the OBD-II codes to ensure no new issues have arisen. If everything is functioning as intended, the faulty oxygen sensor replacement is complete.

By following these steps, you can effectively replace a faulty oxygen sensor in a 2016 Toyota RAV4. Always ensure to work safely and consult the vehicle's manual or a professional mechanic if you encounter difficulties.