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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.
• Raise the vehicle using a jack and secure it with jack stands.

2. Inspect and Replace Oxygen Sensors

1. Remove the upstream oxygen sensor:
   • Locate the upstream oxygen sensor on the exhaust manifold.
   • Use an oxygen sensor socket to unscrew the sensor.
   • Disconnect the wiring harness from the sensor.
2. Install the new upstream oxygen sensor:
   • Connect the wiring harness to the new sensor.
   • Screw the new sensor into place and torque it to the manufacturer's specifications (typically around 30 lb-ft).
3. Repeat for the downstream oxygen sensor:
   • Locate the downstream oxygen sensor.
   • Follow the same steps to remove and install the new sensor.

3. Inspect and Replace Catalytic Converter

1. Remove the catalytic converter:
   • Disconnect the exhaust pipes from the catalytic converter using a socket set.
   • Remove any bolts or brackets holding the converter in place.
   • Carefully take out the catalytic converter.
2. Install the new catalytic converter:
   • Position the new catalytic converter in place, ensuring proper alignment.
   • Reattach the exhaust pipes and secure them with bolts.
   • Torque bolts to the manufacturer's specifications.
3. Reconnect any sensors or wiring harnesses disconnected during removal.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.