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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect Oxygen Sensors

• Tools Required: O2 sensor socket, multimeter.
• Remove the upstream (pre-catalytic) O2 sensor using the O2 sensor socket.
• Test the O2 sensor with a multimeter; it should fluctuate between 0.1 to 0.9 volts. If it does not, replace the sensor.
• Reinstall or replace the sensor as necessary.

3. Replace the Catalytic Converter

• Tools Required: Socket set, torque wrench, exhaust gasket, penetrating oil.
• Locate the catalytic converter and spray any bolts with penetrating oil to ease removal.
• Remove the bolts connecting the catalytic converter to the exhaust pipe and the engine.
• Replace the old catalytic converter with the new one, ensuring that the new unit matches the specifications.
• Reattach all bolts and torque them to the manufacturer's specifications (typically around 30-40 lb-ft, but verify).
• Replace the exhaust gasket to prevent leaks.

4. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.
• Start the vehicle and allow it to reach operating temperature.