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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the vehicle's battery to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
  2. Disconnect the electrical connectors from both oxygen sensors.
  3. Remove the sensors using an oxygen sensor socket.
  4. Install new oxygen sensors (ensure they are the correct type for your vehicle).
  5. Reconnect the electrical connectors to the sensors.

3. Check and Replace the Catalytic Converter

• Sub-steps:
  1. Locate the catalytic converter in the exhaust system.
  2. Remove any heat shields or brackets securing the catalytic converter.
  3. Unbolt the catalytic converter from the exhaust pipes using a socket set (note torque specifications).
  4. Inspect the exhaust pipes for damage or blockages.
  5. Install the new catalytic converter, ensuring proper alignment and sealing with gaskets.
  6. Tighten all bolts to the manufacturer’s torque specifications.

4. Clear Codes and Test Drive

• Sub-steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear the P0420 code.
  3. Take the vehicle for a test drive under various conditions (highway, city).
  4. Monitor for reoccurrence of the check engine light.