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

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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the vehicle's battery to ensure safety during repairs.

2. Inspect and Clean the Exhaust System

• Sub-steps:
  • Visually inspect the exhaust system for any signs of damage or leaks, particularly at joints and seams.
  • If leaks are found, repair or replace the affected sections of the exhaust system.
  • Clean any carbon buildup from the catalytic converter with an appropriate cleaner or replace it if heavily damaged.

3. Replace Oxygen Sensors (if faulty)

• Sub-steps:
  • Remove the oxygen sensors from the exhaust manifold and catalytic converter.
  • Install new oxygen sensors, ensuring they are tightened to manufacturer specifications (usually around 30-40 ft-lbs).
  • Reconnect any electrical connectors for the oxygen sensors.

4. Replace the Catalytic Converter (if necessary)

• Sub-steps:
  • Remove the bolts securing the catalytic converter to the exhaust system.
  • Carefully take out the old catalytic converter and replace it with a new one, ensuring proper orientation.
  • Tighten all bolts to the specified torque settings (refer to manufacturer specifications).
  • Reconnect any associated sensors or components.

5. Reconnect Battery and Test

• Reconnect the vehicle’s battery.
• Start the vehicle and allow it to run for a few minutes to ensure the system is functioning properly.