how to fix P0420 code on 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 necessary tools and parts.
• Disconnect the vehicle's battery.
• Ensure the vehicle is on a flat surface, and set the parking brake.

2. Inspect and Replace Oxygen Sensors (if needed)

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Remove the upstream oxygen sensor using the O2 sensor socket.
• Inspect the sensor for damage; if defective, replace it with a new one.
• Torque the new oxygen sensor to manufacturer specifications (typically around 30 lb-ft).
• Repeat the process for the downstream oxygen sensor if found faulty.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, torque wrench, exhaust sealant.
• Remove any bolts or clamps securing the catalytic converter to the exhaust system.
• Check for physical damage; if damaged, replace it with an OEM or equivalent catalytic converter.
• Install the new catalytic converter and secure it using new gaskets and bolts. Torque to manufacturer specifications.

4. Clear Codes and Test Drive

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0420 code.
• Test drive the vehicle under various conditions to ensure the code does not return.