how to fix P0420 code on Toyota RAV4 Fifth Generation (2019-present)

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

• Tools Required: O2 sensor socket, torque wrench, penetrating oil.
• Apply penetrating oil to the O2 sensor threads to ease removal.
• Disconnect the electrical connector from the upstream and downstream O2 sensors.
• Use the O2 sensor socket to remove the sensors from the exhaust system.
• Install new O2 sensors by threading them into place and tightening to the manufacturer's specifications (usually around 30 lb-ft).
• Reconnect the electrical connectors.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, jack and jack stands, exhaust gasket.
• Raise the vehicle using a jack and secure it with jack stands.
• Remove any heat shields or brackets securing the catalytic converter.
• Unbolt the catalytic converter from the exhaust manifold and the exhaust pipe.
• Inspect the old catalytic converter for damage or clogging.
• Install the new catalytic converter with new gaskets and bolts, torquing to specifications.
• Reattach any heat shields or brackets.

4. Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.