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

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 required.
• Disconnect the vehicle's 12V battery to ensure safety while working on electrical systems.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench, penetrating oil.
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors in the exhaust system.
  2. Apply penetrating oil to the sensor threads to ease removal.
  3. Disconnect the electrical connectors from the sensors.
  4. Use the O2 sensor socket to remove the sensors.
  5. Install new oxygen sensors by reversing the removal process, tightening to the manufacturer’s specified torque.

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, jack stands, exhaust gasket, torque wrench.
• Sub-steps:
  1. Lift the vehicle using a jack and secure it with jack stands.
  2. Remove the exhaust system components that are connected to the catalytic converter.
  3. Remove any bolts or clamps securing the catalytic converter.
  4. Inspect the old catalytic converter for damage or blockage; replace if necessary.
  5. Install the new catalytic converter, ensuring the proper alignment and sealing with a new gasket.
  6. Tighten all bolts to the manufacturer’s specified torque.

4. Reconnect Battery and Clear Codes

• Reconnect the vehicle's 12V battery.
• Use the OBD-II scanner to clear the P0420 error code from the system.