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P0172 code error

Discussion in 'Stock 2002 - 2005 Explorers' started by mcdavidhome, March 21, 2017 at 1:14 AM.

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    1. mcdavidhome

      mcdavidhome New Member

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      Hello all. I'm trying to figure out what's the deal with this P 0172 code that won't seem to go away on my 02 explorer 4.0. I recently replaced plugs, wires, ignition coil, MAF sensor and air intake. According to the scan tool data from AutoZone it's saying bank 1&2 are too lean but my truck is running and idling just fine though. Not doing too good on gas though. Does anyone have any suggestions on how to troubleshoot this problem? Thanks
       
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    3. imp

      imp Well-Known Member

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      @mcdavidhome
      Too lean DECREASES fuel consumption, INCREASES fuel economy. So, an imponderable is presented. How do you know it's not "too good on gas"? P0172 code applies only to Bank 1. If the truck runs as well as you indicate, why are you so concerned?
      imp
       
    4. 2Trux

      2Trux Active Member

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      I believe that the "too lean" code means that the computer is maxing out the fuel adjustment but it is still running lean. This is usually caused by unmetered air getting into the manifold. This could be caused by a bad/cracked vacuum hose, leak in intake hose, or bad/dirty MAF. Since you have replaced the MAF (of course this doesn't mean it's still not bad) I would start looking at all the hoses connected to the intake for splits or breaks.
       
    5. TechGuru

      TechGuru Well-Known Member

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      P0172 is too rich NOT too lean !!! Which would explain why it's not good on gas...

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