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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a level surface and safely secured.
• Disconnect the battery to prevent electrical shock.

2. Inspect Exhaust System

• Sub-steps:
  • Visually inspect all exhaust components for rust, holes, or loose connections.
  • Repair any leaks found using exhaust sealant or replace damaged sections of the exhaust pipe.

3. Replace Faulty Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Sub-steps:
  • Locate the upstream and downstream oxygen sensors (typically situated before and after the catalytic converter respectively).
  • Disconnect the electrical connectors for the sensors.
  • Using the O2 sensor socket, unscrew and remove the faulty sensors.
  • Apply anti-seize compound to the threads of the new sensors and install them, tightening to the manufacturer's specifications (usually around 30 lb-ft).
  • Reconnect the electrical connectors.

4. Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, cutting tool (if necessary), gasket scraper, torque wrench.
• Sub-steps:
  • Remove the exhaust system components connected to the catalytic converter by unbolting or cutting.
  • Clean the mating surfaces to remove old gasket material.
  • Install the new catalytic converter, ensuring proper alignment and sealing.
  • Tighten all bolts to the specified torque (usually around 30 lb-ft).

5. Reset the Engine Control Module

• Sub-steps:
  • Reconnect the battery.
  • Use an OBD-II scanner to clear the P0420 code from the system.