my car has code p171 and p174 on 2003 Ford Windstar

I want to know what is that.

by in Reading, PA on July 16, 2012
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1 answer
ANSWER by , July 16, 2012
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.