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2003 Ford Windstar Question: my car has code p171 and p174

 

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Haydee Millayes, 3.8L V6, Reading, PA, July 16, 2012, 07:05
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I want to know what is that.

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  • Answer #1

    milesauto from Miles Auto Service Inc., July 16, 2012, 08:19
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     Master

    Both codes indicate o2 sensors are staying at a low voltage theshold. Vacuum leaks on this engine are common. Upper intake manifold grommets and bolts have a update design to combat this problem. Have a reliable shop check your car for this.

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