How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Ron Your Own Question
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 33073
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
Type Your Ford Question Here...
Ron is online now
A new question is answered every 9 seconds

Ford Explorer Sport Trac Check Engine Codes PO171 (Bank 1

Resolved Question:

Check Engine Codes PO171 (Bank 1 System too lean) and PO174 (Bank 2 System too lean) came up on my 01 Explorer Sports track while towing my camper. Home now and light still on. What does this mean?
Submitted: 5 years ago.
Category: Ford
Expert:  Ron replied 5 years ago.
Hello and Welcome to Justanswer,

My name is XXXXX XXXXX I am here to try and assist your with your question.

The codes Po171 and P0174 are lean codes bank 1 and Bank 2 and on the 2001 4.0 they are usually set doe to a vacuum leak and on this engine its usually the upper intake gasket leaking. I would start with making sure there are no visible vacuum leaks amount the intake manifold and if none are found, replace the upper intake gasket with Ford redesigned gasket and new isolator bolts.
Ron and 5 other Ford Specialists are ready to help you

Related Ford Questions