The Differential Pressure Feedback sensor (DPFE) helps regulate flow in the Taurus' exhaust gas recirculation (EGR) system. A defective DPFE will cause erratic performance, including possible stuttering, lack of acceleration and poor fuel economy. A bad DPFE may cause the Taurus to fail an emissions test. The DPFE is a sealed device and cannot be repaired. Replace the unit if it malfunctions.
Place the vehicle in "Park" on a level surface, and apply the parking brake. Turn the engine off and allow it to cool for two hours if the car has been recently driven.
Open the hood and disconnect the negative ("-") cable from the battery with a wrench or socket. Remove the positive ("+") cable from the battery.
Using a rag, grasp the DPFE, and pull upward. The DPFE is a black plastic rectangle about 2 inches by 1 inch by a half-inch thick. It is on the passenger side between the engine and the firewall. The rear of the DPFE has an electrical connection and two small hoses that extend downward from the bottom.The rubber hoses and the DPFE should slide off of the metal tubes together. Gently rock the unit from side to side while pulling if it won't come off. Remove the rubber hoses -- they will be used with the new DPFE. Inspect each hose for cracks or tears. Replace as necessary.
Unlock the electrical connector on the top of the DPFE with the separator tool. Gently pry up the plastic retaining clip with a small slotted screwdriver if you do not have the separator tool. Pull the two halves of the connector apart. Discard the old sensor.
Attach the new DPFE to the electrical connector. Press the junction together until it clicks in place. Connect the DPFE to the two rubber hoses. Slide each hose completely over the proper metal nozzle. The longer rubber hose is closer to the vehicle passenger side.
Reattach the battery cables beginning with the positive side.
Leave the hood open and start the engine. Stand on the passenger side, and double-check for hissing or sucking sounds that may indicate vacuum leaks. Turn off the engine to re-seat the DPFE hoses or other leaks discovered. Close the hood, and test drive the car until it reaches operating temperature.
