how to repair P0420 code on Toyota RAV4 Fifth Generation (2019-present)?

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, exhaust thermometer.
• Disconnect the vehicle's battery to ensure safety during repairs.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Use an appropriate socket to remove the sensors from the exhaust system.
  4. Install the new oxygen sensors, ensuring they are tightened to manufacturer specifications (typically around 30 lb-ft).
  5. Reconnect the electrical connectors to the sensors.

3. Inspect and Replace Catalytic Converter (if necessary)

• Sub-steps:
  1. Use a socket set to remove any bolts securing the catalytic converter to the exhaust system.
  2. Carefully lower the catalytic converter from its position.
  3. Inspect the old catalytic converter for damage or blockage.
  4. Install the new catalytic converter, ensuring that all gaskets are replaced and surfaces are clean.
  5. Torque the bolts to the manufacturer’s recommended specifications.

4. Clear Codes and Test Drive

• Sub-steps:
  1. Reconnect the vehicle's battery.
  2. Use the OBD-II scanner to clear the P0420 code from the system.
  3. Start the engine and allow it to reach operating temperature.
  4. Perform a test drive to allow the vehicle's computer to re-evaluate the catalytic converter's efficiency.