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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream and downstream oxygen sensors.
   • Tools needed: O2 sensor socket, ratchet.
2. Disconnect the electrical connectors from both sensors.
3. Remove the sensors using the O2 sensor socket.
4. Install new oxygen sensors (ensure they are compatible with the vehicle).
   • Torque specification: 30 lb-ft for oxygen sensors.
5. Reconnect the electrical connectors securely.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Inspect catalytic converter visually for damage or blockage.
   • Tools needed: Jack and jack stands, exhaust pipe cutter or saw.
2. If blockage or damage is found, proceed to replace the catalytic converter:
   • Lift the vehicle and support with jack stands.
   • Cut or unbolt the exhaust system connections to the catalytic converter.
   • Remove the old catalytic converter.
3. Install the new catalytic converter:
   • Align it with the exhaust pipe and secure it with bolts or clamps.
   • Torque specifications: 25 lb-ft for exhaust bolts.
4. Reconnect any sensors or components removed during the installation.

4. Reset Check Engine Light

1. Reconnect the negative battery terminal.
2. Use an OBD-II scanner to clear the P0420 code from the engine control module.