how to fix P0420 code on Tesla Outback 6th Generation (2020-2024)

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, infrared thermometer, socket set, jack and jack stands.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to avoid electrical shorts.

2. Inspect Exhaust System

• Raise the vehicle using a jack and secure it with jack stands.
• Visually inspect the entire exhaust system, focusing on the catalytic converter and exhaust pipes for any cracks or leaks.
• Tighten any loose connections or replace damaged sections of the exhaust.

3. Test Oxygen Sensors

• Locate the upstream and downstream oxygen sensors.
• Disconnect the sensor connectors.
• Use a multimeter to test the voltage output of the upstream sensor; it should fluctuate between 0.1 to 0.9 volts during operation.
• Replace any faulty oxygen sensors based on test results.

4. Test Catalytic Converter

• Use an infrared thermometer to measure the temperature at the inlet and outlet of the catalytic converter.
• The outlet temperature should be significantly higher than the inlet temperature (at least 100°F difference).
• If the temperature difference is inadequate, consider replacing the catalytic converter.

5. Clear Codes and Recheck

• Reconnect the battery and use the OBD-II scanner to clear the P0420 code.
• Start the engine and allow it to reach operating temperature.
• Drive the vehicle for a brief period (15-30 minutes) to ensure the code does not reappear.