how to fix P0420 code on my Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery before starting work.
• Allow the vehicle to cool down if it has been running.

2. Oxygen Sensor Replacement

• Tools Required: Oxygen sensor socket, ratchet, torque wrench.
• Steps:
  1. Locate the upstream (pre-catalytic) oxygen sensor, typically positioned before the catalytic converter.
  2. Disconnect the electrical connector from the sensor.
  3. Use the oxygen sensor socket to remove the sensor by turning it counterclockwise.
  4. Apply anti-seize compound to the threads of the new sensor.
  5. Install the new sensor by hand, then torque it to the manufacturer's specifications (usually around 30 ft-lbs).
  6. Reconnect the electrical connector.

3. Catalytic Converter Replacement (if necessary)

• Tools Required: Socket set, exhaust hanger removal tool, torque wrench.
• Steps:
  1. Raise and support the vehicle securely on jack stands.
  2. Remove the exhaust hangers using the exhaust hanger removal tool.
  3. Disconnect the exhaust pipes leading to and from the catalytic converter.
  4. Unbolt the catalytic converter from the exhaust manifold and mid-pipe (if applicable).
  5. Install the new catalytic converter, ensuring proper alignment.
  6. Torque the bolts to the manufacturer’s specifications.
  7. Reinstall exhaust hangers and ensure everything is secure.

4. Clear Codes and Test Drive

• Use the OBD-II scanner to clear the P0420 code.
• Start the vehicle and allow it to reach operating temperature.
• Take the vehicle for a test drive to monitor for any returning codes and verify that the check engine light remains off.