engine lite on 4.0L code po171 &174 - FordTough.ca - Home of Canadian Ford Truck Enthusiasts
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post #1 of 3 (permalink) Old 01-28-2009, 11:48 AM
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engine lite on 4.0L code po171 &174

My wifes Explorer (2000) has the engine lite on the codes coming up are PO171 and PO174 meaning lean bank 1 and lean bank 2 .I have cleaned massairflow sensor and tried to check for vaccuum leaks what do I look for ?

Last edited by Pepper; 01-28-2009 at 11:51 AM. Reason: finishing
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post #2 of 3 (permalink) Old 01-28-2009, 02:42 PM
shelbyx1's Avatar
Join Date: Oct 2008
Location: bonnyville alberta
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what engine does it have?the 4.0l was notorios for lower intake leaks,is the cold idle pretty fast?

a moments silence for the shelbyx,i hope her new owner enjoys as much.
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post #3 of 3 (permalink) Old 01-29-2009, 08:20 AM
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Join Date: Feb 2008
Location: Sudbury, Ontario
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My 1998 2.5L V6 Contour had the exact same problem and I was getting those exact codes.

Replaced upper and lower intake manifold gasket and voilà!

There are no stupid questions, but there are a LOT of inquisitive idiots.
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