I'm fighting a p 0401 code. One website says that the DPFE voltage spec values for my 96 Windstar 3.8L are the same as a 2002 Mercury Mountaineer with a 3.8L I watched a You Tube video and the mechanic says that a 2002 Mercury Mountaineer's spec voltage is between .8v and 1.2v. In his example (with vacuum applied to the egr valve), he got 1.96v and he replaced the DPFE. My original DPFE (engine running) had a 1.10 v before I applied vacuum to the egr valve (the gauge stayed steady) and the voltage (on that top wire of 3 wires)increased to 1.41v when vacuum was applied. Idle got rough as I applied vacuum and got smooth when vacuum was removed. I bought a new DPFE and the voltages were 1.07v and 1.36v, when I repeated the test. I bought a 3rd DPFE by Motorcraft and the values are 1.06v and 1.33v For each of the above DPFE units the reference voltage (bottom wire of 3 wires) is 4.97v. I checked the (middle of the 3 wires to B+) return/gnd wire I saw 12.27v, on each DPFE. I read (elsewhere) that the Mountaineer and my 96 Windstar 3.8L had the same specs. My Ford service manual tells me to buy another Fore Emissions Manual and my Haynes book says that the voltage, when the engine is cold should be .2 - .7v and when hot 3v to 6v. None of my DPFE sensors would go past 1.41v with the engine hot. After a test drive of 25 miles on the interstate, I think that my engine is hot enough to get these bigger voltages. What are the voltage specs for my DPFE with no vacuum and with vacuum?

Scuba Diving & Snorkeling - Motorcraft - 1996 DPFE15 Ford Windstar EGR Pressure Feedback Sensor