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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety.
• Allow the engine to cool down before proceeding.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, torque wrench.
• Sub-steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Using the O2 sensor socket, remove the upstream sensor first.
  4. Install the new upstream oxygen sensor and torque it to the manufacturer’s specifications (usually around 30 lb-ft).
  5. Repeat the process for the downstream oxygen sensor.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, ratchet, exhaust hanger removal tool, torque wrench.
• Sub-steps:
  1. Raise the vehicle securely using jack stands.
  2. Remove any exhaust clamps or hangers securing the catalytic converter.
  3. Unbolt the catalytic converter from the exhaust manifold and exhaust pipe.
  4. Inspect the old catalytic converter for damage or blockage.
  5. Install the new catalytic converter, ensuring proper alignment.
  6. Tighten all bolts to the specified torque (usually around 25 lb-ft).
  7. Reattach exhaust clamps and hangers.

4. Reconnect Battery and Clear Codes

• Reconnect the negative terminal of the battery.
• Use the OBD-II scanner to clear the P0420 code from the ECU.
• Start the engine and let it reach operating temperature.