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

Solution

1. Preparation

• Gather tools and parts required.
• Disconnect the battery to avoid electrical shorts during repairs.
• Allow the exhaust system to cool down if the vehicle was recently operated.

2. Inspect and Replace Oxygen Sensors (if faulty)

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Remove the upstream and downstream oxygen sensors from the exhaust system.
• Inspect the sensors visually for damage or contamination.
• If faulty, install new oxygen sensors:
  • Apply anti-seize compound on the threads (if required).
  • Torque the sensors to the manufacturer's specification (usually around 30 lb-ft).

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, exhaust pipe cutter or saw, gaskets.
• Remove the exhaust pipes connected to the catalytic converter:
  • Use an exhaust pipe cutter or saw to cut the pipe if necessary.
• Remove the old catalytic converter from the vehicle.
• Install the new catalytic converter:
  • Use new gaskets to ensure a proper seal.
  • Bolt the catalytic converter in place and torque to the manufacturer's specification (typically 30-40 lb-ft).

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the P0420 code from the system.

5. Final Inspection

• Inspect all connections and ensure there are no exhaust leaks.
• Recheck the mounting of the catalytic converter and sensors.