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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery to prevent electrical shorts.
• Raise the vehicle securely on jack stands if working under it.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Remove the upstream and downstream oxygen sensors:
  • Use the O2 sensor socket to unscrew them from their respective locations.
  • Inspect the threads and connectors for damage.
• Install new oxygen sensors:
  • Apply anti-seize compound on the threads of the new sensors.
  • Torque the sensors to the manufacturer specifications (typically around 30 lb-ft).

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, torque wrench, exhaust pipe cutter (if needed), gaskets
• Remove the catalytic converter:
  • Disconnect any bolts or clamps securing it to the exhaust system.
  • Cut the exhaust pipe if necessary to remove the old converter.
• Install the new catalytic converter:
  • Position the new converter in place, ensuring proper alignment with exhaust pipes.
  • Use new gaskets and secure with bolts, torquing to manufacturer specifications (typically around 30 lb-ft).

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals securely.
• Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.

5. Test Drive

• Drive the vehicle under various conditions to ensure that the code does not return and that the vehicle runs smoothly.