how to fix P0420 code in 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 vehicle's high-voltage battery to ensure safety.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Remove the sensors using the O2 sensor socket and ratchet.
  4. Install new oxygen sensors, tightening them to the manufacturer’s specified torque (usually around 30-40 ft-lbs).
  5. Reconnect the electrical connectors to both sensors.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, torque wrench, exhaust hanger removal tool
• Sub-steps:
  1. Remove any heat shields covering the catalytic converter.
  2. Disconnect the exhaust pipe from the catalytic converter using the socket set.
  3. Remove the catalytic converter from its mountings, being careful not to damage surrounding components.
  4. Install the new catalytic converter, ensuring proper alignment and securing it with the original or new bolts.
  5. Reattach the exhaust pipe and tighten to the manufacturer’s torque specifications.

4. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the high-voltage battery.
  2. Use the OBD-II scanner to clear the P0420 code and any other related codes.
  3. Start the vehicle and allow it to reach operating temperature.