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

• Gather tools and parts required for the repair.
• Disconnect the vehicle's battery to ensure safety.
• Ensure the vehicle is on a flat surface and use jack stands if necessary to access the exhaust system safely.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Remove the upstream oxygen sensor (O2 sensor before the catalytic converter) by loosening it with the O2 sensor socket.
• Install the new upstream oxygen sensor, tightening it to the manufacturer's recommended torque specifications (typically around 30-40 ft-lbs).
• Repeat the process for the downstream oxygen sensor (O2 sensor after the catalytic converter) if needed.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, wrench set, exhaust hanger tool (if applicable).
• Remove any heat shields or covers obstructing access to the catalytic converter.
• Disconnect the exhaust pipes connected to the catalytic converter by loosening the bolts.
• Remove any exhaust hangers using the exhaust hanger tool.
• Replace the faulty catalytic converter with a new unit, ensuring proper alignment with the exhaust system.
• Reattach the exhaust pipes and heat shields, tightening all bolts to the manufacturer's specifications.

4. Clear Codes and Test

• Reconnect the vehicle's battery.
• Use the OBD-II scanner to clear the P0420 code.
• Start the vehicle and allow it to reach operating temperature, then monitor for any recurring codes.