how to fix the P0420 code in my Toyota RAV4 Fourth Generation (2013-2018)?

Solution

1. Preparation

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

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Remove the pre-catalytic oxygen sensor using the O2 sensor socket.
• Inspect the sensor for damage. If faulty, replace with a new sensor (OEM recommended).
• Reinstall the sensor and torque to manufacturer specifications (typically around 30 ft-lbs).
• Repeat for the post-catalytic oxygen sensor if necessary.

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, jack and jack stands, exhaust gasket, torque wrench
• Raise the vehicle with a jack and secure with jack stands.
• Remove the exhaust bolts connecting the catalytic converter to the exhaust manifold and the exhaust pipe.
• Inspect the catalytic converter for physical damage or blockage.
• If necessary, replace the catalytic converter with an OEM part. Ensure that the exhaust gasket is replaced.
• Reinstall the catalytic converter and torque bolts to the manufacturer specifications (typically around 30-40 ft-lbs).

4. Clear Codes and Test Drive

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