how to troubleshoot P0420 code in Tesla Outback 4th Generation (2010-2014)

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, jack and jack stands, safety glasses, gloves.
• 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

1. Locate the pre-catalytic and post-catalytic oxygen sensors on the exhaust manifold and exhaust pipe.
2. Unplug the electrical connectors from both sensors.
3. Use a socket wrench to remove the old oxygen sensors.
4. Apply anti-seize compound to the threads of the new oxygen sensors.
5. Install the new sensors and tighten them to the manufacturer's specified torque settings (usually around 30 ft-lbs).
6. Reconnect the electrical connectors.

3. Inspect and Replace the Catalytic Converter (if necessary)

1. Use a jack to lift the vehicle and secure it with jack stands.
2. Remove the exhaust pipe connecting to the catalytic converter using a socket set.
3. Unscrew any mounting brackets or screws securing the catalytic converter.
4. Remove the old catalytic converter and install the new one, ensuring proper alignment.
5. Reattach the exhaust pipe and secure with the appropriate torque specifications.

4. Clear the Codes and Test Drive

1. Reconnect the negative battery terminal.
2. Use an OBD-II scanner to clear the P0420 code.
3. Start the engine and let it idle for a few minutes.
4. Take the vehicle for a test drive to monitor for any reoccurrence of the check engine light.