how to fix P0420 code on Ford F-150 13th Generation (2015-2020)

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the battery to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Multimeter
• Safety goggles and gloves

2. Inspect and Replace Oxygen Sensors

• Step 1: Locate the upstream and downstream oxygen sensors on the exhaust system.
• Step 2: Use a socket to remove the faulty oxygen sensors from their sockets.
• Step 3: Install new oxygen sensors, ensuring they are tightened to the manufacturer’s specified torque (usually around 30 lb-ft).

3. Inspect and Replace Catalytic Converter

• Step 1: Remove the exhaust components bolted to the catalytic converter using the socket set.
• Step 2: Carefully detach the catalytic converter from the exhaust system.
• Step 3: Inspect the old catalytic converter for internal damage; if damaged, replace it with a new unit.
• Step 4: Reinstall the new catalytic converter, ensuring all bolts are torqued to the manufacturer’s specifications (typically 40 lb-ft).

4. Clear Codes and Test Drive

• Step 1: Reconnect the battery.
• Step 2: Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.
• Step 3: Start the engine and take the vehicle for a test drive to ensure the check engine light does not reappear.