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

Solution

1. Preparation

• Gather tools and parts needed.
• Ensure the vehicle is on a level surface and safely lifted if necessary.
• Disconnect the battery for safety.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, multimeter
• Remove the rear (post-catalytic converter) oxygen sensor:
  1. Disconnect the electrical connector.
  2. Use the O2 sensor socket to unscrew the sensor.
• Verify the operation of the new sensor with a multimeter before installation.
• Install the new oxygen sensor:
  1. Apply anti-seize compound to the threads.
  2. Screw in and tighten to the manufacturer's specifications (generally around 30-50 lb-ft).
  3. Reconnect the electrical connector.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, jack and jack stands, exhaust pipe cutter
• Inspect the catalytic converter for physical damage or clogging:
  1. Remove any heat shields or brackets.
  2. Use an infrared thermometer to measure inlet and outlet temperatures.
• If replacement is needed, cut the exhaust pipe on either side of the catalytic converter.
• Install the new catalytic converter:
  1. Position the new converter in place.
  2. Use new gaskets to prevent leaks.
  3. Weld or clamp the new converter into place, ensuring tight seals at joints.

4. Reassemble and Test

• Reattach any heat shields and components removed during the process.
• Reconnect the battery.
• Start the engine and check for leaks in the exhaust system.
• Clear the P0420 code using an OBD-II scanner.