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

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, socket set, torque wrench, jack and jack stands, exhaust pipe cutter (if necessary).
• Safety: Disconnect the negative battery terminal to avoid electrical shorts during repairs.

2. Replace Catalytic Converter

1. Lift the Vehicle

   • Use the jack to elevate the vehicle and secure it with jack stands.

2. Remove Exhaust Components

   • Use a socket set to unbolt the exhaust pipe sections connected to the catalytic converter. If needed, cut the pipes using the exhaust pipe cutter.
   • Carefully remove any hangers or brackets that are securing the exhaust system.

3. Remove the Old Catalytic Converter

   • Unbolt the catalytic converter from the exhaust manifold and remove it from the vehicle.

4. Install New Catalytic Converter

   • Position the new catalytic converter in place and secure it to the exhaust manifold and exhaust pipe using new gaskets and bolts. Tighten to the manufacturer's specified torque settings.

5. Reinstall Exhaust Components

   • Reattach any removed exhaust sections, hangers, and brackets. Ensure everything is secure.

3. Replace Oxygen Sensors (if necessary)

1. Remove Old Oxygen Sensors

   • If diagnostics indicated faulty oxygen sensors, use the appropriate socket to remove the upstream and downstream oxygen sensors from the exhaust system.

2. Install New Oxygen Sensors

   • Install new oxygen sensors in the same position, ensuring they are properly threaded and tightened.

4. Final Checks

• Reconnect the negative battery terminal and start the engine. Check for any exhaust leaks.
• Clear the P0420 code using the OBD-II scanner.