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codes po171 and po174 codes po171 and po174
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Old 10-05-2006, 20:33   #1 (permalink)
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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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Old 10-06-2006, 12:08   #2 (permalink)
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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.
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Old 10-07-2006, 21:05   #3 (permalink)
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Re: codes po171 and po174
Thanks i will check
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