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 to prevent electrical issues during repair.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  2. Using the O2 sensor socket, carefully unscrew the upstream oxygen sensor from the exhaust manifold.
  3. Install the new upstream oxygen sensor, ensuring it is torqued to the manufacturer’s specification (typically around 30-40 lb-ft).
  4. Repeat the process for the downstream oxygen sensor if it is also faulty.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, exhaust pipe cutter or saw, band clamps, torque wrench.
• Steps:
  1. Lift the vehicle securely on jack stands.
  2. Use an exhaust pipe cutter to remove the old catalytic converter from the exhaust system.
  3. Clean the exhaust pipe ends to ensure a good seal for the new catalytic converter.
  4. Install the new catalytic converter, using band clamps to secure it in place.
  5. Ensure all connections are tight and properly aligned.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals securely.
• Use the OBD-II scanner to clear the P0420 code from the system.