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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is on a flat, stable surface.
• Disconnect the battery to ensure safety while working on the vehicle.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Oxygen sensor socket
• Safety gloves and goggles

2. Inspect and Replace Oxygen Sensors

1. Locate the oxygen sensors: Identify the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
2. Disconnect the sensors: Carefully unplug the sensor connectors.
3. Remove the sensors: Use an oxygen sensor socket to unscrew the sensors from their respective locations.
4. Install new sensors: Apply anti-seize compound to the threads of the new sensors, if necessary, and install them in reverse order. Torque to manufacturer specifications (usually around 30 lb-ft).

3. Inspect and Replace Catalytic Converter (if needed)

1. Disconnect exhaust components: If the catalytic converter needs replacement, unbolt the exhaust pipes connected to it using a socket set.
2. Remove the catalytic converter: Carefully unbolt and extract the catalytic converter from the exhaust system.
3. Install the new catalytic converter: Position the new converter in place and secure it with bolts. Torque the bolts according to the manufacturer's specifications.
4. Reconnect exhaust components: Reattach any other exhaust components that were removed, ensuring seals are replaced as necessary.