how to fix P0420 code on Ford F-150 13th Generation (2015-2020)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and securely raised with jack stands.
• Disconnect the battery to avoid electrical shorts.

2. Inspect and Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Sub-steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) O2 sensors.
  2. Unplug the electrical connectors from both sensors.
  3. Use the O2 sensor socket to unscrew and remove the sensors.
  4. Inspect the threads for damage and clean the mounting area.
  5. Install the new O2 sensors by screwing them in by hand and then tightening to the manufacturer's specifications (typically 30 lb-ft).
  6. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, exhaust pipe cutter, gasket scraper, torque wrench
• Sub-steps:
  1. Remove the exhaust pipes connected to the catalytic converter using a socket set.
  2. Cut any clamps or bolts holding the catalytic converter in place.
  3. Carefully remove the old catalytic converter.
  4. Clean the mating surfaces of the exhaust pipes and the engine.
  5. Install the new catalytic converter, ensuring proper alignment.
  6. Reinstall the exhaust pipes and tighten the bolts to the manufacturer's torque specifications.

4. Clear Codes and Test Drive

• Sub-steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear the P0420 code.
  3. Start the engine and allow it to reach operating temperature.
  4. Take the vehicle for a test drive to ensure the check engine light does not reappear.