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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shocks.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench.
• Remove the upstream oxygen sensor:
  1. Locate the upstream O2 sensor on the exhaust manifold or downpipe.
  2. Use the O2 sensor socket to unscrew the sensor.
  3. Install the new sensor, tightening to the manufacturer’s specified torque (usually around 30 lb-ft).
• Repeat for the downstream O2 sensor if testing indicates it is faulty.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, exhaust pipe cutter or saw, torque wrench.
• Remove the catalytic converter:
  1. Use the socket set to unbolt the catalytic converter from the exhaust manifold and the exhaust pipe.
  2. If necessary, cut the exhaust pipe to remove the old catalytic converter.
• Install the new catalytic converter:
  1. Position the new catalytic converter in place and bolt it securely.
  2. Use a torque wrench to tighten bolts to the manufacturer's specifications (typically around 30-40 lb-ft).

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminal.
• Use the OBD-II scanner to clear the P0420 code and any other related codes.