2003 Windstar> The check engine light went on, I replaced the two O2 senors, codes came back

Asked by Nov 15, 2014 at 08:37 AM about the 2003 Ford Windstar SEL

Question type: Maintenance & Repair

I replaced the two O2 senors, codes 171 and 174 and the EGR valve.. I drove it 85 miles
and it still read not ready for inspection. I drove it another 25 miles as per the mechanic
and the light came back on with the same codes. What does this mean?

2 Answers


check air intake system/air cleaner etc for clean passage, check pcv valve, check for vacuum leaks.


If you clean the mass air flow sensor, be sure to use only mass air flow cleaner. other cleaners can cause problems. if you don't find anything with these suggestions it could be a fuel trim problem. you may have to get someone to hook it up to a monitor and check fuel trim. it can be something as simple as a fuel filter, or a problem with the fuel (low pressure) return line.

Your Answer

Ford Windstar Experts

  • #1
  • #2
  • #3
    Tom Demyan
View All

Related Models For Sale

Used Ford Freestar
539 listings starting at $2,295
Used Honda Odyssey
380 Great Deals out of 29,493 listings starting at $1,642
Used Toyota Sienna
442 Great Deals out of 19,695 listings starting at $1,995
Used Ford Focus
694 Great Deals out of 64,737 listings starting at $999
Used Ford Escort
261 listings
Used Ford Expedition
455 Great Deals out of 17,717 listings starting at $1,000
Used Ford Explorer
1,198 Great Deals out of 64,659 listings starting at $1,499
Used Ford Escape
1,332 Great Deals out of 98,644 listings starting at $1,000
Used Chevrolet Tahoe
903 Great Deals out of 39,853 listings starting at $1,990
Used Buick LeSabre
5 Great Deals out of 1,572 listings starting at $799
Used Chrysler Pacifica
91 Great Deals out of 28,139 listings starting at $2,999
Used Dodge Caravan
528 listings starting at $2,295
Used Chevrolet Suburban
531 Great Deals out of 23,240 listings starting at $1,250

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.