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Kenny Z.
Kenny Z., Ford Senior Master Tech
Category: Ford
Satisfied Customers: 5357
Experience:  Auto Trans, Drivability and Electrical Specialist
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what causes the codes P0171-P0174 ON A 2001 E250 V6

Customer Question

what causes the codes P0171-P0174 ON A 2001 E250 V6
Submitted: 5 years ago.
Category: Ford
Expert:  CTFordTech replied 5 years ago.

Hello and Thank you for choosing Just Answer. My name is Kyle and I will be helping you with your question today.


The codes P0171 and P0174 are common to come on due to a vacuum leak on the engine. The vacuum leak on the V6 engine usually comes from the upper intake manifold gasket and the port gaskets that are inside, under the upper intake manifold and both sets of gaskets will need to be replaced along with the bolts.

Expert:  Kenny Z. replied 5 years ago.

Hello and thanks for your question.


I already responded to your first question from 4:58. Please check that.

Customer: replied 5 years ago.
I had replace this seals before but did not resolve the problem I the light came on again after replacing the seals and after I did that the code comes back it is there any other causefor this problem
Expert:  Kenny Z. replied 5 years ago.
Did you replace the bolts also or reuse the old ones?