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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to prevent electrical shorts.
• Ensure the vehicle is on a level surface and raise it using jack stands for access to the exhaust components.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  • Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  • Disconnect the wiring harness from both sensors.
  • Use an O2 sensor socket to remove the sensors from the exhaust pipes.
  • Install the new oxygen sensors by threading them into the exhaust and tightening securely (typically 30-35 ft-lbs).
  • Reconnect the wiring harness to the sensors.

3. Examine and Replace Catalytic Converter (if necessary)

• Sub-steps:
  • If the catalytic converter is damaged or inefficient (as determined in the diagnostic steps), prepare to replace it.
  • Remove the exhaust pipe bolts securing the catalytic converter using a socket set.
  • Detach any additional brackets or hangers holding the catalytic converter.
  • Install the new catalytic converter, ensuring proper alignment.
  • Reconnect all bolts and tighten to manufacturer specifications (typically 30-40 ft-lbs).
  • Check for any exhaust leaks after installation.

4. Clear Codes and Test Drive

• Sub-steps:
  • Reconnect the vehicle battery.
  • Use the OBD-II scanner to clear the P0420 code.
  • Start the engine and allow it to reach operating temperature.
  • Take the vehicle for a test drive to monitor for any reoccurrence of the check engine light.