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

Solution

1. Preparation

• Tools Required:
  • OBD-II scanner
  • Socket set
  • Torque wrench
  • Multimeter
  • Exhaust pipe cutter (if necessary)
• Clear the DTC (diagnostic trouble code) using the OBD-II scanner before performing repairs.
• Ensure the vehicle is on a flat surface and secure it with wheel chocks.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  • Locate the upstream and downstream oxygen sensors.
  • Disconnect the battery to prevent electrical shorts.
  • Unplug the oxygen sensor connectors.
  • Use a socket to remove the oxygen sensors from the exhaust pipes.
  • Install new oxygen sensors (ensure correct torque specifications, usually around 30 lb-ft).
  • Reconnect the oxygen sensor connectors.

3. Check and Replace Catalytic Converter

• Sub-steps:
  • Disconnect the battery again for safety.
  • Remove any heat shields covering the catalytic converter.
  • Use an exhaust pipe cutter to remove the old catalytic converter if it is welded in place.
  • Install the new catalytic converter using new gaskets, ensuring a proper seal.
  • Torque the bolts to the manufacturer’s specifications (typically around 30-40 lb-ft).
  • Reinstall any heat shields removed earlier.

4. Final Checks

• Sub-steps:
  • Reconnect the battery.
  • Start the engine and allow it to reach operating temperature.
  • Re-scan the vehicle with the OBD-II scanner to ensure the P0420 code is cleared and does not return.