how to fix P0420 code in Tesla Outback 6th Generation (2020-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Raise the vehicle using a jack and secure it with jack stands.

2. Inspect and Replace Oxygen Sensors

• Tools Required: Socket set, O2 sensor socket, multimeter.
• Remove the upstream oxygen sensor connected to the exhaust manifold.
  • Use the O2 sensor socket for easy removal.
• Inspect for carbon buildup or damage.
• If faulty, replace the sensor with a new one.
• Reinstall the sensor and reconnect the wiring harness.

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, torque wrench.
• Remove the catalytic converter from the exhaust system.
  • Unbolt the flanges and remove any brackets securing it.
  • If any bolts are rusted, use penetrating oil to ease removal.
• Inspect the new catalytic converter for compatibility.
• Install the new catalytic converter, ensuring proper alignment.
• Torque bolts to the manufacturer’s specifications (refer to the service manual).

4. Reset the Engine Control Unit (ECU)

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0420 code from the ECU.