how to fix P0420 code in Toyota RAV4 XA40 (2013-2018)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the exhaust system to cool before starting work.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
2. Remove the electrical connectors from both oxygen sensors.
3. Using an O2 sensor socket, remove the sensors from the exhaust system.
4. Install the new O2 sensors, ensuring they are torqued to manufacturer specifications (usually around 30-50 lb-ft).
5. Reconnect the electrical connectors to the sensors.

3. Inspect and Replace Catalytic Converter (if necessary)

1. If the catalytic converter is damaged or clogged, proceed to replace it.
2. Remove the exhaust pipe connected to the catalytic converter using a socket set.
3. Unbolt the mounting brackets securing the catalytic converter to the exhaust system.
4. Remove the old catalytic converter and install the new one, ensuring proper alignment.
5. Torque the bolts to the manufacturer’s specifications (typically 30-40 lb-ft).
6. Reconnect the exhaust pipe securely.

4. Clear Codes and Test

1. Reconnect the negative battery terminal.
2. Use the OBD-II scanner to clear the P0420 code.
3. Start the vehicle and allow it to reach operating temperature.
4. Take the vehicle for a test drive to verify that the check engine light does not reappear.