The DPFE sensor on the Ford F-150 is part of the exhaust gas recirculation system, which runs exhaust gasses back through the combustion chamber to remove any unburned fuel and other pollutants from the exhaust before it exits the vehicle. The DPFE monitors the air pressure in the EGR system and sends that information to the power train control module, which adjusts the system based on that information. If your check engine light comes on and you retrieve a P0402 code, there's a good chance you have a faulty DPFE and you should replace it.
Lift the hood and locate the DPFE sensor, which mounts to the side of the EGR assembly, just above the fuel rail near the throttle body on the passenger side of the engine. The sensor is either silver or black and rectangular in shape.
Remove the first hose from the old DPFE and plug it into the corresponding port on the new DPFE. Remove the second hose and transfer it to the new DPFE as well.
Disconnect the wiring harness from the old DPFE by hand. Remove the bolt holding the DPFE in place with the socket set. Pull the old sensor out by hand.
Bolt the new DPFE into position using the socket set and connect the wiring harness to it by hand.
