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

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical issues.
• Allow the vehicle to cool if it has been recently driven.

2. Inspect and Repair Exhaust System

• Sub-steps:
  1. Lift the vehicle securely using jack stands.
  2. Visually inspect the entire exhaust system for cracks, holes, or rust.
  3. Repair any visible leaks using exhaust tape or replace damaged sections as necessary.

3. Replace Oxygen Sensors (if faulty)

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors connected to the exhaust system.
  2. Disconnect the electrical connectors from both sensors.
  3. Use an oxygen sensor socket to remove the faulty sensors.
  4. Install new oxygen sensors, tightening them to the manufacturer’s specifications (usually around 30 Nm).
  5. Reconnect the electrical connectors.

4. Replace Catalytic Converter (if necessary)

• Sub-steps:
  1. Remove the exhaust components preceding the catalytic converter.
  2. Disconnect any brackets or hangers securing the catalytic converter.
  3. Unbolt the catalytic converter from the exhaust system.
  4. Install the new catalytic converter and secure it with the bolts to the specified torque (usually around 40 Nm).
  5. Reattach any hangers and brackets.

5. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the vehicle's battery.
  2. Use an OBD-II scanner to clear the P0420 code from the vehicle’s computer.