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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the battery to prevent electrical shocks during repairs.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Sub-steps:
  1. Locate and remove the upstream oxygen sensor (before the catalytic converter) using the O2 sensor socket.
  2. Install the new upstream oxygen sensor and torque it to the manufacturer’s specification (typically around 30 lb-ft).
  3. Repeat the process for the downstream oxygen sensor (after the catalytic converter) if necessary.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, jack stands, exhaust pipe cutter (if needed), torque wrench.
• Sub-steps:
  1. Raise the vehicle using jack stands for access to the exhaust system.
  2. Remove the bolts securing the catalytic converter to the exhaust pipes; you may need to use an exhaust pipe cutter if the pipes are rusted or damaged.
  3. Replace with a new catalytic converter, ensuring proper fitment and alignment.
  4. Reinstall the exhaust bolts and torque them to the specified value (typically around 25 lb-ft).

4. Clear Codes and Reconnect Battery

• Sub-steps:
  1. Reconnect the battery.
  2. Use an OBD-II scanner to clear the P0420 code from the system.

5. Final Inspection

• Sub-steps:
  1. Start the engine and allow it to reach operating temperature.
  2. Check for exhaust leaks around the catalytic converter and sensor installations.