Question about 2001 Ford Explorer Sport

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2001 Ford Explorer check engine light

Check engine light came on, indicating po171 and 174 replaced MAF sensor yesterday drove 60 miles check engine light came on again, vehicle runs very good - but did notice that fuel comsumption was lower when we replace the MAF sensor, when the light came on it seemed to consume more fuel may be my imagination but thought it was worth noting. Husband did check for vacumn leaks - none - also checked resistors - we have another MAF sensor coming in tomorrow to see if the one we received from store was faulty - we arehoping that we don't have to replace the other 2 sensors - if this is the path we need to go which one would you suggest we change first to save ourselves the headache and the money - ? whats the best route for process of elimination in saving time and money?? Thanks in advance for any suggestions

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  • rpatsches Jul 18, 2008

    problem fixed- it was the PCV hose -

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Fords have, very coming problems with vacium leaks, make sure to check the pcv hose assemvbly, one of the best ways to check it is to have it check with a smoke machine, but if you want to do it your self buy a carburetor clener and make sure it says flamable, the start the engine and spray litle by little all over the vacium hoses, if the rpm increases or drecrese by doing that, pay attention where are you spraying the fluid because you just found the leak

Posted on Aug 21, 2008

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Had the same problem and i change the defe sensor and check engine lightg went of and never did came back on

Posted on Aug 12, 2008

9 out of 10 it is a vaccum leak. Take it to a trusted mechanic and tell them only to look for vaccum leaks. I assure you that is what it is. I just had mine taken care of for 130.

Posted on Sep 17, 2008

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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...


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 onepx.gif Setting Conditions onepx.gif onepx.gif 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

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The most common problem on a Ford with these codes is deteriorated PCV hoses. Check the hoses from the PCV valve to the intake manifold. Pay special attention to the rubber elbows. They often crack on the inside curve and the crack is hard to see.

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