how to fix P0420 code on Tesla Model S Original (2012-2020)

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent any electrical issues during the repair.
• Raise the vehicle using a jack and secure it on jack stands for safety.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Remove the upstream oxygen sensor from the exhaust manifold.
  • Sub-steps:
    • Disconnect the sensor’s electrical connector.
    • Use the O2 sensor socket to unscrew and remove the sensor.
• Install the new upstream oxygen sensor.
  • Sub-steps:
    • Apply anti-seize compound to the threads of the new sensor (if applicable).
    • Torque to manufacturer specifications (typically around 30-40 lb-ft).
    • Reconnect the electrical connector.

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, torque wrench, exhaust hanger removal tool.
• Remove the old catalytic converter.
  • Sub-steps:
    • Disconnect any exhaust hangers and bolts securing the catalytic converter.
    • Carefully remove the converter from the exhaust system.
• Install the new catalytic converter.
  • Sub-steps:
    • Position the new converter in place and secure it with bolts.
    • Torque bolts to manufacturer specifications (typically around 25-30 lb-ft).
    • Reinstall exhaust hangers that were removed.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals securely.
• Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.