how to fix P0420 code in Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench, multimeter
• Remove the upstream and downstream oxygen sensors using the O2 sensor socket.
• Inspect the connectors for damage and corrosion; clean or replace as necessary.
• If faulty, install new oxygen sensors, tightening them to the manufacturer’s specified torque (usually around 30 ft-lbs).

3. Inspect and Replace Catalytic Converter (if needed)

• Tools Required: Socket set, jack and jack stands, exhaust pipe cutter (if necessary), gasket scraper
• If the catalytic converter is damaged or clogged, raise the vehicle and support it securely.
• Remove the exhaust pipes connected to the catalytic converter using the socket set; cut if necessary.
• Remove the old catalytic converter and clean the mounting surfaces.
• Install the new catalytic converter and ensure all gaskets are in place.
• Reconnect the exhaust pipes and secure them with the proper torque.

4. Clear Error Codes

• Reconnect the battery and use the OBD-II scanner to clear any stored codes.
• Start the engine and allow it to reach operating temperature.