how to fix P0420 code on Tesla Model S Original (2012-2020)

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

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the ignition is off.
• Gather necessary tools and safety equipment.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Disconnect the battery to avoid electrical shorts.
  2. Locate the upstream and downstream oxygen sensors; they are typically near the exhaust manifold and after the catalytic converter, respectively.
  3. Remove the sensors using an oxygen sensor socket.
  4. Inspect the wiring and connectors for signs of wear or damage.
  5. Install new oxygen sensors (ensure they are the correct type for your model) and torque to manufacturer's specifications (usually around 30-40 lb-ft).
  6. Reconnect the battery.

3. Inspect and Replace Catalytic Converter

• Sub-steps:
  1. Raise the vehicle and securely support it with jack stands.
  2. Remove any covers or shields obstructing access to the catalytic converter.
  3. Detach the inlet and outlet pipes from the catalytic converter using a socket set, typically 13mm or 15mm bolts.
  4. Inspect the catalytic converter for blockages or signs of damage (e.g., rattling sounds).
  5. If damaged, install a new catalytic converter, ensuring all gaskets and seals are replaced.
  6. Reattach the exhaust pipes and torque the bolts to specifications (usually around 25-30 lb-ft).
  7. Lower the vehicle back to the ground.