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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the vehicle's battery to prevent electrical shock.
• Allow the exhaust system to cool before working on it.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  2. Remove the connectors from both oxygen sensors.
  3. Using an oxygen sensor socket, remove the upstream sensor first, then the downstream sensor.
  4. Install new oxygen sensors by reversing the removal steps. Ensure they are tightened to the manufacturer's specifications (typically around 30 ft-lbs).

3. Inspect and Replace Catalytic Converter

• Sub-steps:
  1. Remove the heat shield covering the catalytic converter if applicable.
  2. Unbolt the catalytic converter from the exhaust system using a socket set, ensuring all mounting bolts are removed.
  3. Inspect the old catalytic converter for any signs of clogging or damage.
  4. Install the new catalytic converter, ensuring to use new gaskets and sealing materials as required.
  5. Torque the bolts to the manufacturer's specifications (usually about 30-40 ft-lbs).

4. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the battery terminals, ensuring a secure connection.
  2. Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.

5. Final Inspection

• Sub-steps:
  1. Start the engine and allow it to reach operating temperature.
  2. Inspect for any exhaust leaks around the newly installed components.