I have a 1999 Windstar 3.8 L. Have the codes PO171 and 174.

Asked by Mar 15, 2014 at 05:47 PM about the 1999 Ford Windstar 4 Dr SE Passenger Van

Question type: Maintenance & Repair

I have codes PO171 and PO174. I have changed the MAF sensor, DPFE sensor, fuel filter and downstream and upstream O2 sensors. I reset the computer by disconnecting the battery. Codes came up after 60 miles of driving both highway and city driving. What else could it be causing these codes? Someone please help.

1 Answer

261,405

Those codes are usually caused by a vacuum leak, or unmetered air that is entering the engine after the MAF sensor. Check all your rubber hoses and gaskets. I usually run the engine and pop the hood and move some hose around to hear hissing, you can also spray some carb cleaner around suspected areas, if there is a leak, the idle will increase. If you can't find one , you can do a "smoke test" that can pinpoint the area of the leak.

1 of 1 people found this helpful.

Your Answer

Ford Windstar Experts

  • #1
    JohnBarJB
    Reputation
    580
  • #2
    T_S_T
    Reputation
    460
  • #3
    Tom Demyan
    Reputation
    420
View All

Related Models For Sale

Used Chrysler Town & Country
338 Great Deals out of 13,720 listings starting at $1,000
Used Toyota Sienna
490 Great Deals out of 26,389 listings starting at $1,250
Used Dodge Grand Caravan
374 Great Deals out of 26,426 listings starting at $1,750
Used Honda Odyssey
450 Great Deals out of 30,844 listings starting at $1,000
Used Ford Explorer
1,064 Great Deals out of 70,896 listings starting at $1,000
Used Dodge Caravan
577 listings
Used Ford Focus
756 Great Deals out of 57,648 listings starting at $1,150
Used Ford Expedition
355 Great Deals out of 17,195 listings starting at $1,930
Used Honda Accord
1,111 Great Deals out of 66,541 listings starting at $561
Used Ford Mustang
564 Great Deals out of 36,656 listings starting at $1,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.