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

Learn how to diagnose and fix P0420 catalytic converter issues in Tesla Model S. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the vehicle battery to prevent any electrical issues while working on the vehicle.

2. Inspect and Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, torque wrench, penetrating oil
• Steps:
  1. Locate the upstream and downstream oxygen sensors on the exhaust system.
  2. Spray penetrating oil on the sensor threads to ease removal.
  3. Use the O2 sensor socket to remove the upstream sensor first.
  4. Install the new upstream oxygen sensor by hand, and then tighten to manufacturer specifications (typically 30-40 lb-ft).
  5. Repeat for the downstream oxygen sensor if it shows signs of failure.

3. Inspect and Replace the Catalytic Converter (if necessary)

• Tools Required: Socket set, jack and jack stands, exhaust clamps, gasket scraper
• Steps:
  1. Raise the vehicle securely on jack stands.
  2. Locate the catalytic converter and disconnect exhaust clamps and any bolts securing it.
  3. Remove the old catalytic converter carefully.
  4. Clean the mating surfaces with a gasket scraper to ensure a good seal.
  5. Install the new catalytic converter, securing it with the bolts and clamps to manufacturer specifications.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals securely.
• Use an OBD-II scanner to clear the P0420 code from the system.