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

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, basic hand tools (sockets and wrenches), torque wrench.
• Safety Warnings: Disconnect the vehicle battery before working on electrical systems. Allow the exhaust system to cool before inspection.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream and downstream oxygen sensors on the exhaust system.
2. Disconnect the electrical connectors from both oxygen sensors.
3. Use a socket wrench to remove the sensors from their mounting locations.
4. Install new oxygen sensors (if faulty) by threading them into place and tightening to the manufacturer’s torque specifications (usually around 30 ft-lbs).
5. Reconnect the electrical connectors securely.

3. Inspect and Repair Exhaust Leaks

1. Visually inspect the exhaust system from the engine to the tailpipe for any visible damage or leaks.
2. Use a smoke test or soapy water to identify minor leaks not visible during inspection.
3. If leaks are found, repair or replace the damaged sections of the exhaust system.

4. Replace the Catalytic Converter (if necessary)

1. If the catalytic converter is determined to be faulty, begin by locating and supporting the exhaust system to prevent stress on the hangers.
2. Use an exhaust pipe cutter or saw to cut the old catalytic converter out of the system.
3. Install the new catalytic converter, ensuring proper alignment with existing exhaust components.
4. Use new gaskets and clamps as required, and tighten to the specified torque settings.

5. Reset the PCM

1. Reconnect the vehicle battery.
2. Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.
3. Start the vehicle and allow it to reach operating temperature.