how to fix P0420 code on Tesla Model Y Current (2020-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is on a level surface and securely raised with jack stands.

2. Inspect and Repair Exhaust System

• Sub-steps:
  • Visually inspect the entire exhaust system for any cracks or holes.
  • If any leaks are found, repair or replace the damaged section of the exhaust.
• Tools Required: Exhaust repair kit, socket set.

3. Replace Oxygen Sensors

• Sub-steps:
  • Disconnect the battery to ensure safety.
  • Locate the upstream and downstream oxygen sensors in the exhaust system.
  • Remove the old sensors using an oxygen sensor socket.
  • Install the new sensors, ensuring they are properly torqued (consult specifications for torque values).
  • Reconnect the battery.
• Tools Required: Oxygen sensor socket, torque wrench.

4. Replace Catalytic Converter (if necessary)

• Sub-steps:
  • If the catalytic converter is damaged or contaminated, remove it from the exhaust system.
  • Install a new catalytic converter, ensuring all connections are secure and leak-free.
  • Torque all bolts to manufacturer specifications.
• Tools Required: Socket set, torque wrench.

5. Clear Codes and Test

• Sub-steps:
  • Use an OBD-II scanner to clear the P0420 code from the ECM.
  • Start the vehicle and allow it to reach normal operating temperature.
  • Perform a test drive to ensure no codes return.
• Tools Required: OBD-II scanner.