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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety.
• Allow the engine to cool before starting work.

2. Inspect and Replace Oxygen Sensors

1. Locate the oxygen sensors: Identify the upstream and downstream oxygen sensors.
2. Remove oxygen sensors:
   • Use an oxygen sensor socket to unscrew the upstream and downstream sensors.
   • Disconnect the wiring harnesses carefully.
3. Install new oxygen sensors:
   • Apply anti-seize compound on the threads of the new sensors.
   • Install the new sensors and tighten them to the manufacturer’s specifications (typically around 30-40 ft-lbs).
   • Reconnect the wiring harnesses.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Check for damage: If the catalytic converter is damaged or clogged, it needs replacement.
2. Remove catalytic converter:
   • Loosen the exhaust clamps and bolts securing the catalytic converter.
   • Carefully remove the catalytic converter from the exhaust system.
3. Install new catalytic converter:
   • Position the new catalytic converter and secure it with clamps and bolts to the manufacturer’s specifications (usually around 15-25 ft-lbs).
   • Ensure all gaskets are replaced to prevent leaks.

4. Clear Codes and Test Drive

1. Reconnect the battery: Ensure all connections are secure.
2. Use the OBD-II scanner: Clear the P0420 code from the system.
3. Test drive the vehicle: Drive for at least 20 minutes to allow the system to recalibrate and check if the check engine light reappears.