how to fix P0420 code on Ford Explorer Fifth Generation (2011-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on the vehicle.

2. Inspect and Replace Oxygen Sensors (if faulty)

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Sub-steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  2. Unplug the electrical connectors from the sensors.
  3. Using the O2 sensor socket, remove both sensors from the exhaust system.
  4. Install new sensors by threading them into place and tightening them to the manufacturer’s specified torque (usually around 30 ft-lbs).
  5. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, jack and jack stands, exhaust pipe cutter (if needed)
• Sub-steps:
  1. Raise the vehicle securely using jack stands.
  2. Locate the catalytic converter and inspect for any damages or clogging.
  3. If replacement is necessary, unbolt the catalytic converter from the exhaust system.
  4. If the converter is welded in place, use an exhaust pipe cutter to remove it.
  5. Install the new catalytic converter by reversing the removal steps, ensuring all bolts are tightened to specified torque.
  6. Lower the vehicle safely.

4. Clear Error Codes

• Tools Required: OBD-II scanner
• Sub-steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear the P0420 code from the system.
  3. Start the engine and allow it to reach operating temperature.