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Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 35832
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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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: 6 years ago.
Category: Ford
Expert:  Ron replied 6 years ago.
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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.
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