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

Learn how to diagnose and fix P0420 code related to catalytic converter efficiency in Tesla Model S (2012-2020). Step-by-step guide included.

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, exhaust gas temperature (EGT) gauge.
• Disconnect the vehicle's battery to ensure safety while working on electrical components.

2. Inspect and Test Oxygen Sensors

• Remove the oxygen sensor(s) from the exhaust system.
• Test each sensor with a multimeter:
  • Set the multimeter to measure voltage.
  • Start the vehicle and observe the voltage output; it should fluctuate between 0.1V to 0.9V for a functioning sensor.
• Replace any faulty oxygen sensors as necessary.

3. Examine and Replace Catalytic Converter

• If the catalytic converter is determined to be defective:
  • Raise the vehicle and secure it on jack stands.
  • Remove any heat shields or brackets securing the catalytic converter.
  • Disconnect the exhaust pipe from the catalytic converter using a socket set.
  • Remove the catalytic converter from its mounting points.
  • Install the new catalytic converter, ensuring proper alignment and fit.
  • Torque the mounting bolts to the manufacturer’s specifications.
  • Reattach any heat shields or brackets.

4. Reinstall Oxygen Sensors

• Install the new or tested oxygen sensors back into the exhaust system.
• Ensure proper torque specifications are followed for sensor installation.

5. Reset Engine Control Module (ECM)

• Reconnect the vehicle's battery.
• Use the OBD-II scanner to clear the P0420 code from the ECM.