my Tesla Model S Plaid/Refresh (2021-present) has a P0420 code how do I fix it

Learn how to diagnose and fix P0420 exhaust system issue in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench.
• Remove the upstream and downstream oxygen sensors:
  1. Use the O2 sensor socket to unscrew the sensors from their respective locations.
  2. Inspect the sensors for signs of damage or contamination.
• Install new oxygen sensors:
  1. Apply anti-seize compound to the threads of the new sensors.
  2. Torque the sensors to the manufacturer's specifications (typically around 30 lb-ft).

3. Inspect and Replace Catalytic Converter

• Tools Required: Wrench set, jack and jack stands, exhaust gasket sealant.
• Raise the vehicle and secure it on jack stands.
• Remove the exhaust system components leading to the catalytic converter:
  1. Unbolt any clamps and hangers holding the exhaust pipes.
  2. Detach the catalytic converter from the exhaust manifold and downstream pipe.
• Inspect the old catalytic converter for signs of damage or clogging.
• Install the new catalytic converter:
  1. Ensure the mating surfaces are clean.
  2. Apply exhaust gasket sealant as needed.
  3. Bolt the new catalytic converter in place and torque to specifications.

4. Reconnect Battery and Test

• Reconnect the negative battery terminal.
• Start the vehicle and let it idle for a few minutes.

5. Clear Codes

• Use the OBD-II scanner to clear the P0420 code.
• Take the vehicle for a test drive to verify that the issue has been resolved.