2000 Ford Windstar

does the vehicle have any trouble driving? If not, you may have a vaccum leak on one side of your engine. It would have to be on cylinders #1, 2, or 3 which are located on the back side of the engine compartment (up under the windshield wiper cowel). It also could be an injector sticking, but you would more that likely notice a difference in the way it drives as well as a misfire code.

[quote:65dff51ce9="SUREN"]Engine problem
2000 Ford Windstar Automatic 196935 miles
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Check engline light is on -code is P0171. Kindly advise me as to the best possible repair.[/quote:65dff51ce9]

I had the same problem they told me it was the mass air flow sensor, and it wasn't i still get the same code, im still trying to figure it out!