how do I fix P0420 code on 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

• Tools Required: OBD-II scanner, multimeter, exhaust pressure gauge, jack and jack stands, basic socket set, safety goggles, gloves.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
  2. Disconnect the wiring harness from each oxygen sensor.
  3. Use a socket wrench to remove the sensors.
  4. Inspect the threads and connectors of the old sensors for damage.
  5. Install new oxygen sensors by reversing the removal steps, ensuring they are properly torqued (typically 30-40 ft-lbs).
  6. Reconnect the wiring harness securely.

3. Inspect and Replace Catalytic Converter (if necessary)

• Sub-steps:
  1. Raise the vehicle using a jack and secure it with jack stands.
  2. Locate the catalytic converter in the exhaust system.
  3. Inspect for any signs of damage, such as dents or rust.
  4. If replacement is necessary, disconnect the exhaust pipes from the catalytic converter using a socket set.
  5. Remove any mounting bolts or brackets securing the catalytic converter.
  6. Install the new catalytic converter, ensuring all bolts are torqued to manufacturer specifications.
  7. Reattach the exhaust pipes and ensure there are no leaks.

4. Clear Codes and Test Drive

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use an OBD-II scanner to clear the P0420 code from the vehicle's computer.
  3. Start the engine and allow it to reach operating temperature.
  4. Take the vehicle for a test drive under various driving conditions to check for recurrences of the code.