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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Ensure the vehicle is on a level surface and secure it with jack stands if needed.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench, ratchet set
• Remove the upstream oxygen sensor using the O2 sensor socket.
• Inspect the sensor for damage, clean the connector, and replace if faulty.
• Install the new sensor and torque it to the manufacturer’s specification (typically around 30 lb-ft).
• Repeat the process for the downstream oxygen sensor if necessary.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, torque wrench, exhaust pipe cutter (if necessary)
• Remove any bolts securing the catalytic converter to the exhaust system.
• Carefully detach the catalytic converter from the exhaust pipe.
• Inspect the old catalytic converter for physical damage or blockage.
• Install the new catalytic converter, ensuring it is properly aligned and secured.
• Torque all bolts to the manufacturer’s specifications.

4. Check Exhaust System

• Inspect the exhaust system for any leaks or cracks, especially around the joints and connections.
• Use exhaust sealant to repair any minor leaks.
• Ensure all exhaust hangers are intact and properly support the system.