how to fix P0420 code for my 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.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.
• Disconnect the negative terminal of the battery.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Remove the upstream and downstream oxygen sensors:
  1. Locate the oxygen sensors on the exhaust system.
  2. Use the O2 sensor socket to unscrew the sensors from their respective positions.
• Install new oxygen sensors:
  1. Apply anti-seize compound to the threads of the new sensors.
  2. Torque to manufacturer specifications (typically around 30 ft-lbs).

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, cutting tools (if necessary), gaskets
• Remove the old catalytic converter:
  1. Unbolt the exhaust pipes connected to the catalytic converter.
  2. If necessary, cut the exhaust pipes to remove the converter.
• Install the new catalytic converter:
  1. Position the new catalytic converter in place.
  2. Use new gaskets and bolts to securely attach the converter to the exhaust system.

4. Reconnect Battery and Clear Codes

• Reconnect the negative terminal of the battery.
• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.

5. Test Drive

• Start the vehicle and allow it to reach operating temperature.
• Conduct a test drive to ensure the check engine light does not reappear.