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

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.
• Disconnect the negative terminal of the battery to avoid electrical shock.

2. Inspect and Replace O2 Sensors

1. Locate the O2 Sensors:
   • Identify the upstream and downstream O2 sensors connected to the exhaust system.
2. Remove the O2 Sensors:
   • Use a wrench or O2 sensor socket to carefully unscrew the sensors from the exhaust system.
   • Inspect the connectors for damage.
3. Install New O2 Sensors:
   • Apply anti-seize compound to the threads of the new sensors.
   • Install the sensors securely and reconnect the electrical connectors.

3. Inspect the Catalytic Converter

1. Visual Inspection:
   • Check for cracks, dents, or signs of overheating on the catalytic converter.
   • Ensure the heat shield is intact.
2. Temperature Testing:
   • Start the vehicle and allow it to reach normal operating temperature.
   • Use an infrared thermometer to measure the temperature before and after the catalytic converter. A significant temperature difference indicates a functioning converter.
3. Replacement (if necessary):
   • If the catalytic converter is damaged or not functioning, remove it by unbolting it from the exhaust system.
   • Install the new catalytic converter, ensuring proper alignment and sealing.

4. Clear Codes and Test Drive

1. Clear the P0420 Code:
   • Use the OBD-II scanner to clear the P0420 code from the system.
2. Reconnect the Battery:
   • Reconnect the negative terminal of the battery.
3. Test Drive:
   • Drive the vehicle for a short distance to ensure the code does not return and monitor performance.