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2000 Ford Explorer fault code 171 and 174

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Feb 2, 2011, 12:00 PM

Post #1 of 2 (5176 views)
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
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Feb 2, 2011, 4:20 PM

Post #2 of 2 (5171 views)
Re: 2000 Ford Explorer fault code 171 and 174 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.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

(This post was edited by Hammer Time on Feb 2, 2011, 4:23 PM)

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