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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Allow the vehicle to cool down before working on the exhaust system.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, multimeter
• Sub-steps:
  1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Use the O2 sensor socket to remove the upstream oxygen sensor, followed by the downstream sensor.
  4. Install new oxygen sensors by screwing them in by hand, then tighten them to the manufacturer's specifications (typically around 30 lb-ft).
  5. Reconnect the electrical connectors securely.

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

• Tools Required: Socket set, torque wrench, gasket scraper, exhaust pipe cutter
• Sub-steps:
  1. Locate the catalytic converter in the exhaust system.
  2. Remove the exhaust hangers and any bolts securing the catalytic converter using a socket set.
  3. Carefully remove the catalytic converter and inspect it for physical damage or clogging.
  4. If replacement is necessary, install the new catalytic converter with new gaskets, ensuring it is secured tightly.
  5. Torque the bolts to the manufacturer's specifications.

4. Clear Codes and Test

• Tools Required: OBD-II scanner
• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.
  3. Start the engine and let it reach operating temperature.
  4. Take the vehicle for a test drive to ensure the check engine light does not reappear.