how to fix P0420 code in Tesla Outback 5th Generation (2015-2019)

Solution

1. Preparation

• Tools Required: OBD-II scanner, jack and jack stands, socket set, torque wrench, multimeter, exhaust pipe cutter (if necessary).
• Gather replacement parts as needed (e.g., catalytic converter, oxygen sensors).
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Replace Faulty Oxygen Sensors (if needed)

• Locate the upstream and downstream oxygen sensors connected to the exhaust.
• Use a socket wrench to carefully unscrew the sensors.
• Install the new oxygen sensors, ensuring they are properly torqued to the manufacturer’s specifications (typically around 30 ft-lbs).
• Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter

• If the catalytic converter is confirmed to be faulty, proceed to replace it.
• Lift the vehicle using a jack and secure it with jack stands.
• Remove bolts securing the catalytic converter to the exhaust system using a socket set.
• If necessary, use an exhaust pipe cutter to remove the old catalytic converter.
• Install the new catalytic converter and torque the bolts to the manufacturer’s specifications.
• Ensure all connections are sealed to prevent exhaust leaks.

4. Clear Codes and Test

• Reconnect the negative battery terminal.
• Use an OBD-II scanner to clear the P0420 code.
• Start the engine and let it idle for a few minutes to ensure proper operation.