how can I fix the 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

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent any electrical issues.
• Ensure the vehicle is on a level surface, and raise it using jack stands for better access to the exhaust system.

2. Inspect and Replace Oxygen Sensors (if faulty)

• Tools Required: O2 sensor socket, ratchet, and torque wrench.
• Sub-steps:
  1. Locate the pre-catalytic converter and post-catalytic converter oxygen sensors.
  2. Disconnect the wiring harness from each sensor.
  3. Use the O2 sensor socket to remove the faulty sensors.
  4. Install the new oxygen sensors by threading them into place and tightening them to the manufacturer’s specifications (typically around 30 lb-ft).
  5. Reconnect the wiring harness securely.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, exhaust hanger tool, and torque wrench.
• Sub-steps:
  1. Remove any protective covers or shields obstructing access to the catalytic converter.
  2. Disconnect the exhaust pipes from the catalytic converter using the socket set.
  3. Use the exhaust hanger tool to remove any hangers holding the catalytic converter in place.
  4. Remove the old catalytic converter from the vehicle.
  5. Install the new catalytic converter, ensuring gaskets are replaced and connections are secure.
  6. Torque bolts to manufacturer specifications (usually around 25 lb-ft).

4. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0420 code and any other codes present.