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 ensure safety while working on electrical components.
• Raise the vehicle and secure it on jack stands.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Remove the upstream (pre-catalytic) oxygen sensor:
  1. Use the O2 sensor socket to unscrew the sensor from the exhaust manifold.
  2. Disconnect the electrical connector from the sensor.
• Install the new upstream oxygen sensor:
  1. Apply anti-seize compound to the threads of the new O2 sensor.
  2. Screw in the new sensor by hand, then tighten to the manufacturer's specified torque (typically around 30 ft-lbs).
  3. Reconnect the electrical connector.
• Repeat the process for the downstream (post-catalytic) oxygen sensor.

3. Inspect and Replace the Catalytic Converter (if necessary)

• Tools Required: Socket set, cutting torch (if needed), exhaust clamps
• Inspect the catalytic converter for damage:
  1. Look for dents, cracks, or signs of excessive heat.
  2. Shake the converter to check for loose materials inside.
• If replacement is needed:
  1. Cut the exhaust pipes on either side of the catalytic converter using a cutting torch (if necessary).
  2. Remove the old converter and clean the exhaust pipe ends.
  3. Install the new catalytic converter using exhaust clamps, ensuring proper alignment.
  4. Reconnect any other exhaust components removed during the process.

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.