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		Ford Forums - Mustang Forum, Ford Trucks and Cars > Ford Trucks \| Utes \| Vans \|SUVs \| Crossovers > Ford Expedition Forum \| Lincoln Navigator Forum
codes po171 and po174

Ford Expedition Forum | Lincoln Navigator Forum Forum for discussion of the Ford Expedition and Lincoln Navigator.

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10-05-2006, 19:33	#1 (permalink)
mikedannielle Registered User Join Date: Oct 2006 Posts: 2	codes po171 and po174 Have a 1999 expedition with check engine light on. Codes are PO171 system too lean bank one, also getting code PO174 system too lean bank two. I have replaced all 4 O2 sensors, fuel filter, plugs, wires, air filter. HEEELPPPP

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10-06-2006, 11:08	#2 (permalink)
Johnny Mullet Hi-Tech Redneck Join Date: Jun 2006 Location: Ashtabula, Ohio Age: 39 Posts: 1,486	Re: codes po171 and po174 You need to check the PCV system and all vacuum hoses for leaks. If none are found, it may be an intake gasket leaking.

10-07-2006, 20:05	#3 (permalink)
mikedannielle Registered User Join Date: Oct 2006 Posts: 2	Re: codes po171 and po174 Thanks i will check

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