how to resolve P0420 code in Tesla Outback 5th Generation (2015-2019)

Solution

1. Preparation

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

2. Inspect and Replace Oxygen Sensors

1. Locate the oxygen sensors:
   • The upstream sensor is located in the exhaust manifold or exhaust pipe before the catalytic converter.
   • The downstream sensor is located after the catalytic converter.
2. Remove the oxygen sensors:
   • Use an oxygen sensor socket to unscrew the sensors from their respective locations.
3. Install new oxygen sensors:
   • Apply anti-seize compound to the threads of the new sensors.
   • Thread in the new sensors and tighten to manufacturer specifications (typically 30 ft-lbs).
4. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Check the catalytic converter for damage:
   • Look for physical damage or rattling sounds indicating a failed converter.
2. Remove the catalytic converter:
   • Loosen and remove the bolts or clamps securing the converter to the exhaust system.
   • Carefully detach it from the exhaust pipes.
3. Install the new catalytic converter:
   • Position the new converter and secure it with bolts or clamps.
   • Ensure all gaskets are replaced to prevent leaks.
4. Reconnect any exhaust hangers.

4. Reconnect Battery and Clear Codes

1. Reconnect the negative battery terminal.
2. Use the OBD-II scanner to clear the P0420 code from the ECM.
3. Start the engine and allow it to reach operating temperature.