how to fix P0420 code on Tesla Outback 5th Generation (2015-2019)

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Remove the upstream sensor using the O2 sensor socket and ratchet.
  4. Install the new upstream sensor and torque it to the manufacturer's specification (typically 30-40 ft-lbs).
  5. Repeat the process for the downstream sensor if deemed necessary.

3. Check and Replace Catalytic Converter

• Tools Required: Socket set, torque wrench, exhaust hanger removal tool.
• Sub-steps:
  1. Remove any heat shields or components obstructing access to the catalytic converter.
  2. Unbolt the catalytic converter from the exhaust system using the socket set.
  3. Inspect the mounting flange and gaskets; replace if degraded.
  4. Install the new catalytic converter, ensuring proper alignment.
  5. Torque the bolts to the manufacturer’s specifications (usually around 25-30 ft-lbs).

4. Reassemble and Reconnect Battery

• Reinstall any heat shields or components removed during the repair.
• Reconnect the negative battery terminal securely.