how to fix P0420 code on Tesla Model 3 Original (2017-2023)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is in a safe location with adequate ventilation.
• Disconnect the battery to avoid any electrical issues.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Sub-steps:
  1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Remove the sensors using the O2 sensor socket and ratchet.
  4. Install new oxygen sensors, ensuring to torque them to the manufacturer's specifications.
  5. Reconnect the electrical connectors.

3. Examine and Replace Catalytic Converter

• Tools Required: Socket set, ratchet, exhaust hanger removal tool
• Sub-steps:
  1. Support the vehicle securely on jack stands.
  2. Locate the catalytic converter in the exhaust system.
  3. Remove any heat shields covering the catalytic converter.
  4. Disconnect the exhaust pipes from the catalytic converter using a socket set.
  5. Remove any mounting brackets and hangers.
  6. Install the new catalytic converter in the reverse order of removal, ensuring all bolts are torqued to specification.
  7. Reinstall heat shields if applicable.

4. Reconnect Battery and Clear Codes

• Reconnect the vehicle battery.
• Use the OBD-II scanner to clear the P0420 code.