2003 Ford Windstar Q&A

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

I want to know what is that. -
Answer 1
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. -