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Check engine code PO171 & PO174

Discussion in 'Stock 1995 - 2001 Explorers' started by mountainboys, June 29, 2011.

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    1. mountainboys

      mountainboys New Member

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      '99 XLT
      1999 4.0 V6 Explorer, Driving me crazy. The PO171, system to lean Bank 1- PO174, system to lean bank 2 codes. Checked all sensors related to these codes, replaced MAP, cleaned throttle body and valve, checked for vacuum leaks, none. Clears for three days and returns. Anyone experiance a repair on this?
      Thanks,
      JV
       
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    3. sjr033

      sjr033 Active Member

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      There are tons of threads on those codes. Just use the search. But know that it is p0171 & p0174 not po171 & po174
       
    4. mountainboys

      mountainboys New Member

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      thanks, I'll see if I can find something
      Joe Van.:)
       
    5. drdoom

      drdoom Well-Known Member

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      Once I was doing some work on the valve cover, and unknowingly knocked the hose loose that goes to the IAC. Got the same codes, and the truck would not even idle until I reconnected the hose.
       
    6. JetTech1966

      JetTech1966 New Member

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      I had the same exact codes on my 98 Explorer and replaced the upper and lower intake gaskets. Problem solved. It was quite a pain and time consuming but well worth it to do it myself because the entire gasket kit was $100. I can't imagine how much it would have cost to have someone else do it.
       
    7. swshawaii

      swshawaii Explorer Addict

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