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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to prevent any electrical issues during the repair.

2. Inspect and Replace Oxygen Sensors

1. Remove the upstream oxygen sensor:

   • Use an O2 sensor socket and ratchet to unscrew the sensor from the exhaust manifold.
   • Disconnect the electrical connector.

2. Install the new upstream oxygen sensor:

   • Apply anti-seize compound on the threads of the new sensor.
   • Screw the new sensor into the exhaust manifold and tighten it to the manufacturer's specifications (usually around 30 lb-ft).
   • Reconnect the electrical connector.

3. Repeat for the downstream oxygen sensor if needed, following the same steps.

3. Inspect and Replace Catalytic Converter

1. Remove the old catalytic converter:

   • Loosen the bolts connecting the catalytic converter to the exhaust pipe and manifold using a socket set.
   • Remove any hangers or brackets securing the catalytic converter.
   • Carefully take out the catalytic converter from the vehicle.

2. Install the new catalytic converter:

   • Position the new catalytic converter in place.
   • Secure it with bolts and tighten them to the specified torque (usually around 40 lb-ft).
   • Reattach any hangers or brackets.

4. Reset the OBD-II System

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