Differential Pressure Feedback EGR (DPFE) Sensor
WARNING: This page is about a different car, the 1995 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
DPFE sensor is a capacitive type pressure transducer that monitors the pressure difference across a metering orifice, located inside sensor. The DPFE sensor outputs a voltage signal to the PCM that is proportional to the pressure drop across the metering orifice.
The PCM uses the voltage as feedback information on the rate of EGR flow. The PCM uses feedback to adjust the EVR duty cycle and achieve the desired EGR flow. See Figure .