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

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the battery to ensure safety while working on electrical components.

Tools Required:

• OBD-II scanner
• Multimeter
• Socket set
• Torque wrench
• Exhaust pipe cutter (if necessary)

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
2. Disconnect the electrical connectors from both sensors.
3. Use a socket wrench to remove the sensors from the exhaust system.
4. Install the new oxygen sensors by reversing the removal process. Torque to the manufacturer's specifications.
5. Reconnect the electrical connectors to the sensors.

3. Inspect and Replace the Catalytic Converter

1. If the catalytic converter is damaged, proceed to replace it.
2. Use an exhaust pipe cutter to remove the damaged catalytic converter from the exhaust system.
3. Clean any residue from the exhaust flanges where the catalytic converter will attach.
4. Install the new catalytic converter, ensuring proper alignment.
5. Use a torque wrench to tighten the bolts to the manufacturer’s specifications.
6. Reconnect any exhaust hangers or brackets as necessary.