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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Sub-steps:
  1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Use the O2 sensor socket to remove the sensors.
  4. Install new sensors in reverse order, tightening to the manufacturer’s specified torque (usually around 30 lb-ft).
  5. Reconnect electrical connectors.

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, cutting torch or saw (if necessary), exhaust clamp tool.
• Sub-steps:
  1. Inspect the catalytic converter for physical damage or clogging.
  2. If replacement is necessary, disconnect the exhaust pipes from the catalytic converter using appropriate tools.
  3. Remove any mounting brackets or bolts securing the catalytic converter.
  4. Install the new catalytic converter, ensuring proper alignment and sealing with new gaskets.
  5. Reattach exhaust pipes and secure with clamps or bolts.

4. Clear Codes and Test Drive

• Tools Required: OBD-II scanner.
• 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. Conduct a test drive to monitor performance and ensure the check engine light does not return.