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Discussion Starter · #1 · (Edited)
My 2000 Taurus Duratec, at 132,000 miles, threw a Code P0401 (EGR Flow Insufficient) last evening. It has the black composite UIM. Transmission performance was adversely affected between 35 and 40 mph. Replaced the EGR Pressure Feedback (DPFE) Sensor with a BWD EGR631 from Advance Auto Parts. Problem totally solved.

Seals inside the transducer deteriorate, over time, and allow caustic moisture from the EGR system to affect the electronic circuitry. Short trips and ethanol in gasoline contribute to the moisture problem.
 
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