Question about 2001 Ford Explorer

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I have a 1997 Ford Explorer. Check engine light comes on after 20 miles. After reseting the check engine light. The codes that come up are P 171 & P174. I already changed out the Maf sensor. But cant get truck to pass smog test HELP!!

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  • ntruji11 May 11, 2010

    how does it drive? rough, smooth?

  • Anonymous Mar 24, 2014

    just had a smog test and it passed

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Here is a list of possible causes, hope this helps.


Your vehicle’s computer system has self-testing capability. When the computer senses that there is a problem with one of the components or sensors it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and you need to diagnosed and repaired it. The list of possible codes number in the hundreds. The code itself doesn't tell exactly what component is defective - it only indicates where to look, or what engine parameter is out of normal range. You or a technician will have to perform further testing to pinpoint cause and the proper repair. Even if you reset the light, if the underlying problem is not addressed it will come back on.

Possible Causes I have a 1997 Ford Explorer. Check engine light - onepx.gif Setting Conditions I have a 1997 Ford Explorer. Check engine light - onepx.gif"http://i.fixya.net/uploads/iI have a 1997 Ford Explorer. Check engine light - onepx.gifpx.gif" alt="onepx.gif" class="h_mi" /> onepx.gif onepx.gif

  • Air leaks after the MAF sensor, or leaks in the PCV system
  • Vehicle running out of fuel or engine oil dip stick not seated
  • EGR valve gasket is damaged or leaking around the gasket
  • Exhaust leaks before or near where the HO2S is mounted
  • Fuel injector(s) not supplying enough fuel
  • Fuel system not supplying enough fuel during high fuel demand conditions (e.g., the fuel pump may not supply enough fuel)
  • MAF sensor is dirty (can cause PCM to underestimate airflow)
  • Intake gasket leak

Posted on Mar 10, 2009

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