how to fix P0420 code on Tesla Outback 4th Generation (2010-2014)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to avoid electrical shorts.
• Ensure the vehicle is on a flat surface and secure with wheel chocks.

2. Inspect and Replace Oxygen Sensors

1. Remove the upstream oxygen sensor:
   • Use an oxygen sensor socket to carefully unscrew the sensor from the exhaust manifold.
   • Disconnect the wiring harness from the sensor.
2. Install the new upstream oxygen sensor:
   • Apply anti-seize compound on the threads of the new sensor (if applicable).
   • Screw in the new sensor by hand, then tighten with the sensor socket to the manufacturer’s specified torque (typically 30-40 ft-lbs).
   • Reconnect the wiring harness.
3. Repeat for the downstream oxygen sensor following the same procedure.

3. Inspect and Replace Catalytic Converter (if needed)

1. Remove the exhaust system components:
   • Loosen and remove the bolts securing the exhaust flange to the catalytic converter using a socket set.
   • Disconnect any hangers or brackets holding the exhaust system.
2. Remove the catalytic converter:
   • Unbolt the catalytic converter from the exhaust pipe and remove it from the vehicle.
3. Inspect the replacement catalytic converter:
   • Ensure it meets OEM specifications and is compatible with the vehicle.
4. Install the new catalytic converter:
   • Position the new catalytic converter in place and secure it with bolts to the exhaust pipe.
   • Reattach any hangers or brackets.
5. Reassemble the exhaust system:
   • Reconnect the exhaust flange, ensuring a tight seal.

4. Final Checks

• Reconnect the vehicle battery.
• Start the engine and allow it to reach operating temperature.
• Perform a visual inspection to ensure there are no leaks in the exhaust system.