how to fix P0420 code in Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0420 exhaust system issue in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, jack and jack stands, exhaust gas analyzer (optional).
• Clear any existing error codes and ensure the vehicle is parked on a level surface with the engine off.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream and downstream oxygen sensors (usually near the catalytic converter).
2. Use a socket wrench to remove the faulty oxygen sensor(s).
3. Install the new oxygen sensor(s) and torque to manufacturer's specifications (typically around 30 lbs-ft).
4. Reconnect the battery and clear the codes again to reset the system.

3. Check and Repair Exhaust Leaks

1. Visually inspect the exhaust system for any signs of damage or leaks.
2. Use a smoke machine or soapy water to check for leaks if necessary.
3. Repair or replace any damaged sections of the exhaust system, ensuring all joints are sealed properly.

4. Inspect and Replace Catalytic Converter (if necessary)

1. If the catalytic converter is confirmed faulty, support the vehicle with jack stands.
2. Remove any heat shields or brackets securing the catalytic converter.
3. Disconnect the exhaust pipes from the catalytic converter using a socket set.
4. Replace the catalytic converter with a new unit, ensuring proper fitment.
5. Reattach all components, including heat shields, and tighten all bolts to specification.