how to fix P0420 code in Ford Explorer Sixth Generation (2020-present)

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is turned off.
• Disconnect the negative battery cable to avoid electrical shorts.
• Gather necessary tools and parts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, multimeter.
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Remove the sensors using the O2 sensor socket.
  4. Test the new sensors with a multimeter to ensure they meet specifications.
  5. Install the new sensors and reconnect the electrical connectors.

3. Examine and Replace the Catalytic Converter (if defective)

• Tools Required: Socket set, jack stands, exhaust pipe cutter (if applicable).
• Sub-steps:
  1. Raise the vehicle using jack stands and remove the undercarriage cover if necessary.
  2. Locate the catalytic converter along the exhaust system.
  3. Disconnect the exhaust pipes from both ends of the catalytic converter.
  4. Remove any mounting brackets securing the converter.
  5. Install the new catalytic converter, ensuring proper alignment.
  6. Reconnect all exhaust components and secure them with the appropriate hardware.

4. Clear DTCs and Test Drive

• Sub-steps:
  1. Reconnect the negative battery cable.
  2. Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.
  3. Start the engine and let it idle for a few minutes.
  4. Take the vehicle for a test drive to ensure the check engine light does not reappear.