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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the vehicle battery to ensure safety.
• Allow the exhaust system to cool before beginning work.

2. Inspect and Replace Oxygen Sensors

• Step 1: Locate the upstream and downstream oxygen sensors.
• Step 2: Disconnect the electrical connectors from both sensors.
• Step 3: Use an O2 sensor socket to remove the sensors from the exhaust system.
• Step 4: Install new oxygen sensors in their respective locations, ensuring proper torque (typically 30 lb-ft).
• Step 5: Reconnect the electrical connectors to the sensors.

3. Inspect and Replace Catalytic Converter

• Step 1: Visually inspect the catalytic converter for physical damage or signs of overheating.
• Step 2: If damaged, remove the catalytic converter by loosening the bolts or clamps securing it to the exhaust system.
• Step 3: Install the new catalytic converter, ensuring proper alignment and sealing.
• Step 4: Torque the bolts to the manufacturer's specifications (often around 30-40 lb-ft).
• Step 5: Reconnect any exhaust hangers or supports that were removed.

4. Clear Codes and Test

• Step 1: Reconnect the vehicle battery.
• Step 2: Use an OBD-II scanner to clear the P0420 code.
• Step 3: Start the engine and allow it to reach operating temperature.
• Step 4: Perform a test drive to monitor the vehicle's performance and check for the return of the check engine light.