Differential Pressure Feedback EGR Sensor (Tube Mounted)
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2003 Mercury Sable, 2003 Mercury Mountaineer, 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
Tube mounted DPFE EGR sensor is identical in operation as remote mounted larger metal or plastic DPFE sensors and uses a one volt offset. HI and REF hose connections are marked on underside of sensor. See Fig 1.