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2000 Ford Explorer fault code 171 and 174


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Blackcreek
New User

Feb 2, 2011, 2:00 PM

Post #1 of 2 (4070 views)
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2000 Ford Explorer fault code 171 and 174 Sign In

2004 Explorer
4.0 L overhead valve
105,000+ miles

The engine runs and starts just fine check engine light is on, I hooked it up to an OBD2 car Reader the reader reports fuel system to lean cylinder Bank 2 (trouble: code PO174) and fuel system to lean cylinder bank 1 (trouble: code PO171) now my question is what can cause this problem any help would be greatly appreciated.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 2, 2011, 6:20 PM

Post #2 of 2 (4065 views)
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Re: 2000 Ford Explorer fault code 171 and 174 [In reply to] Sign In

There are lots of things that cause an engine to run too lean but on a Ford the most common cause is a vacuum leak Listen for a hissing noise and follow it to it's source.
If you happen to be using a K&N air filter, you may have trashed your MAF.

PS, I deleted your duplicate question. One is sufficient.




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(This post was edited by Hammer Time on Feb 2, 2011, 6:23 PM)




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