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

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle’s battery to ensure safety.
• Allow the vehicle to cool down completely if the engine has been running.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench, multimeter
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors in the exhaust system.
  2. Disconnect the electrical connectors from both sensors.
  3. Use the O2 sensor socket to unscrew and remove the faulty sensors.
  4. Install new oxygen sensors and secure them in place.
  5. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, torque wrench, exhaust gasket set
• Sub-steps:
  1. Inspect the catalytic converter for any signs of damage or clogging.
  2. If replacement is necessary, unbolt the catalytic converter from the exhaust system using a socket set.
  3. Remove any exhaust gaskets and clean the mating surfaces.
  4. Install the new catalytic converter, ensuring it is oriented correctly.
  5. Torque the bolts to the manufacturer’s specifications to secure the converter.

4. Clear Codes and Test

• Tools Required: OBD-II scanner
• Sub-steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.
  3. Start the vehicle and allow it to reach operating temperature.
  4. Perform a test drive to ensure the check engine light remains off.