how to fix P0420 code on my Tesla Model S Plaid/Refresh (2021-present)

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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle's battery to ensure safety during repairs.
• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, safety glasses, gloves.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Use a socket to remove the old sensors.
  4. Install the new oxygen sensors and torque them to the manufacturer's specifications (typically around 30-40 Nm).
  5. Reconnect the electrical connectors.

3. Inspect and Replace the Catalytic Converter (if necessary)

• Sub-steps:
  1. Remove any heat shields covering the catalytic converter.
  2. Unbolt the catalytic converter from the exhaust manifold and exhaust pipe using a socket set.
  3. Carefully remove the old catalytic converter and inspect the exhaust pipes for any debris.
  4. Install the new catalytic converter, ensuring correct alignment.
  5. Torque the bolts to the manufacturer's specifications (usually around 30 Nm).
  6. Reinstall the heat shields.

4. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the vehicle's battery.
  2. Use the OBD-II scanner to clear the P0420 code from the system.
  3. Start the vehicle and allow it to reach operating temperature.