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Ford WindstarIntroduced in the mid-1990s, the front-wheel-drive Ford Windstar minivan campaigned with an emphasis on, and reputation for, safety. And in the hotly contested family minivan market of the time, that was an especially solid piece of ground to be on. As long as buyers didn't need to haul adults in back on a regular basis, the Windstar served a family's needs just fine.
We have a 2003 Windstar/3.8L v6/auto and the check engine light came on. The only code that came up was the P1406 (Differential Pressure Feedback Electronic Sensor circuit Downstream Hose). Any ideas or help on how to tackle this?
I had the same code a few years back on my 1999 3.8L. It turned out my DPFE sensor was bad. If you pop the hood and face the engine the dpfe sensor is right up front on the drivers side near the end of the valve cover. It is practically staring at you. Very easy to find. Pop the hoses off of the bottom and check to see if they are clogged. You can test the sensor yourself. If you have a Haynes manual it tells you how to do this in chapter 6 section 14 and 15(6-14;6-15). If you don't have a manual I can probably type it out for you.
If the sensor is bad. Then it is easy to replace yourself. Two bolts, two vaccuum lines, and a wiring harness. Just make sure you label which vac. line is which. Part will run you around $86. That is what it cost me 2 yrs ago. Dealer wanted $190 to do the job. Ford part number is F77Z-9J460-AB
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p1406 Code 2003 Windstar 
Linear Mode
