how to resolve P0420 code in my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the vehicle to cool down if it has been running.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Remove the O2 sensors from the exhaust system using the O2 sensor socket.
• Inspect the sensors for any damage or contamination.
• If necessary, replace with new OEM or quality aftermarket oxygen sensors.
• Torque the new sensors to the manufacturer’s specifications (typically around 30 ft-lbs).

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, torque wrench, exhaust gasket scraper.
• Remove the exhaust pipes connected to the catalytic converter by loosening the bolts and nuts with the socket set.
• Carefully detach the catalytic converter from the vehicle.
• Inspect for any physical damage or blockages.
• Install a new OEM or quality aftermarket catalytic converter, ensuring to replace any gaskets.
• Torque the bolts and nuts to the manufacturer's specifications (typically around 30 ft-lbs).

4. Clear Fault Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.

5. Test Drive

• Start the vehicle and allow it to reach operating temperature.
• Perform a test drive to ensure the check engine light does not reappear and the vehicle operates smoothly.