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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery before working on electrical systems.
• Allow the vehicle to cool if it has been running.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Sub-steps:
  1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
  2. Use an O2 sensor socket to remove both sensors.
  3. Inspect the sensors for damage or contamination. Replace if necessary.
  4. Install the new sensors and torque them to the manufacturer's specifications (typically around 30 lb-ft).

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, jack stands, exhaust clamps, cutting tool (if necessary)
• Sub-steps:
  1. Raise the vehicle using jack stands for easy access to the exhaust system.
  2. Remove any clamps or bolts securing the catalytic converter to the exhaust system.
  3. Carefully detach the catalytic converter. If it’s welded, you may need to cut it out.
  4. Install the new catalytic converter, ensuring proper alignment.
  5. Secure it with clamps or bolts, torquing them to the manufacturer's specifications.

4. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the battery terminals.
  2. Use the OBD-II scanner to clear the P0420 code from the engine control module.

5. Test Drive

• Sub-steps:
  1. Start the vehicle and allow it to idle for a few minutes.
  2. Take the vehicle for a test drive to ensure the check engine light does not reappear.