my Tesla Model S Original (2012-2020) dashboard shows P0420 code how to fix

Learn how to diagnose and fix P0420 exhaust system issue in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts for the repair.
• Gather the following tools:
  • OBD-II scanner
  • Multimeter
  • Socket set
  • Torque wrench
  • Exhaust pipe cutter (if necessary)
• Ensure the vehicle is parked on a flat surface and the engine is cool.

2. Inspect and Replace Oxygen Sensors

1. Locate the oxygen sensors:
   • Identify the pre-catalytic and post-catalytic oxygen sensors in the exhaust system.
2. Disconnect the battery:
   • Disconnect the negative terminal of the battery to avoid electrical shock.
3. Remove the old sensors:
   • Use a socket wrench to unscrew the oxygen sensors from their respective locations.
4. Install new sensors:
   • Apply anti-seize compound to the threads of the new oxygen sensors.
   • Screw in the new sensors by hand and tighten them with a torque wrench to the manufacturer’s specifications (typically around 30-40 Nm).
5. Reconnect the battery:
   • Reconnect the negative terminal of the battery.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Check for damage:
   • If the catalytic converter appears damaged or clogged, it will need to be replaced.
2. Remove the exhaust components:
   • Use an exhaust pipe cutter to separate any damaged sections if necessary.
   • Unbolt the catalytic converter from the exhaust system using a socket set.
3. Install the new catalytic converter:
   • Position the new catalytic converter and secure it with bolts.
   • Torque the bolts to the manufacturer’s specifications.
4. Reattach any exhaust components:
   • Ensure all exhaust components are securely fastened to prevent leaks.