how to fix P0420 code on Toyota RAV4 Fourth Generation (2013-2018)

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 avoid electrical shorts.

Tools Required:

• OBD-II scanner
• Multimeter
• Socket set
• Torque wrench
• Jack and jack stands

Parts Required:

• New catalytic converter (if needed)
• New oxygen sensors (if needed)
• Exhaust gaskets

2. Inspect and Replace the Oxygen Sensors

1. Locate the upstream and downstream oxygen sensors.
2. Use a socket wrench to remove the sensors from their ports.
3. Compare the old sensors with the new ones to ensure compatibility.
4. Install the new sensors and tighten to manufacturer's torque specifications (usually around 30 ft-lbs).
5. Reconnect the electrical connectors for both sensors.

3. Inspect and Replace the Catalytic Converter

1. Remove the exhaust heat shield if necessary (using socket set).
2. Disconnect the exhaust pipes from the catalytic converter using the appropriate socket.
3. Remove the old catalytic converter.
4. Install the new catalytic converter, ensuring proper alignment.
5. Use new exhaust gaskets and tighten bolts to the specified torque (typically around 40 ft-lbs).

4. Reassemble Exhaust Components

1. Reattach any exhaust heat shields that were removed.
2. Ensure all connections are tight and leak-free.

5. Reconnect Battery and Clear Codes

1. Reconnect the negative battery terminal.
2. Use the OBD-II scanner to clear the P0420 code.
3. Start the engine and let it idle for a few minutes.