how to troubleshoot P0420 code in Tesla Model S Plaid/Refresh (2021-present)

Learn how to troubleshoot and fix P0420 code in Tesla Model S Plaid. 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 flat surface and the engine is cool.
• Disconnect the vehicle's battery for 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 on the exhaust system.
  2. Using the O2 sensor socket, carefully remove the upstream oxygen sensor first.
  3. Install the new upstream oxygen sensor and torque to the manufacturer's specifications (typically around 30-40 ft-lbs).
  4. Repeat the process for the downstream oxygen sensor if necessary.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Wrench set, exhaust pipe cutter (if applicable), gasket scraper.
• Sub-steps:
  1. Locate the catalytic converter and inspect for any physical damage or blockage.
  2. If replacement is required, disconnect the exhaust pipes from the catalytic converter using the appropriate wrenches.
  3. Remove any mounting bolts or clamps holding the catalytic converter in place.
  4. Install the new catalytic converter, ensuring proper alignment with exhaust pipes and secure with bolts.
  5. Use a gasket scraper to clean the mating surfaces before reassembly.

4. Reconnect Battery and Clear Codes

• Reconnect the vehicle's battery.
• Use the OBD-II scanner to clear the P0420 code and any other stored codes.