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 battery to ensure safety during the repair process.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Remove the upstream (pre-catalytic) oxygen sensor:
  1. Locate the sensor on the exhaust manifold.
  2. Use the O2 sensor socket to carefully unscrew the sensor.
  3. Inspect the sensor for damage; replace it if necessary.
• Install the new oxygen sensor:
  1. Apply anti-seize compound to the threads of the new sensor.
  2. Screw in the new sensor by hand and then tighten to the manufacturer’s specified torque (usually around 30 lb-ft).
• Repeat the process for the downstream (post-catalytic) oxygen sensor.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, torque wrench, exhaust hanger removal tool
• Remove the catalytic converter:
  1. Use the socket set to disconnect the exhaust pipes from the catalytic converter.
  2. Remove any mounting bolts holding the converter in place.
  3. Carefully lower and remove the catalytic converter from the vehicle.
• Install the new catalytic converter:
  1. Position the new converter in place, ensuring proper alignment with the exhaust pipes.
  2. Secure it with the mounting bolts and tighten to the specified torque.
  3. Reconnect the exhaust pipes with new gaskets if necessary.

4. Clear Codes and Test

• Reconnect the vehicle battery.
• Use the OBD-II scanner to clear the P0420 code.
• Start the engine and let it run until it reaches operating temperature.