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Old 10-24-2011, 04:22 PM   #1
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Ford Contour LX P0171


This code shows up for the past 2 years. Car is running great. During this time, I have replaced O2 sensor, clean MAF sensor, smoke test with no leak. No one are able to find what is causing this f**** code to come up.


I used the OBDCOM software to save the sensors when I was driving the car. Please let me know if you cold find any problem. Thanks


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Old 10-24-2011, 04:32 PM   #2
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Ford Contour LX P0171


You don't have a vacuum hose leaking somewhere, do you? I had a vac hose come off of a defroster damper once that caused a lean engine code.

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Old 10-24-2011, 04:43 PM   #3
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Ford Contour LX P0171


I used a smoke machine and I couldn't find any leak. Also another mechanic did the same test. I will check the defroster damper....
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Old 10-24-2011, 04:45 PM   #4
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Ford Contour LX P0171


While you are doing the test, switch the AC/heater controls all around. There are at least 2 vacuum controlled dampers.
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Old 10-24-2011, 04:55 PM   #5
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Ford Contour LX P0171


Quote:
Originally Posted by Maintenance 6 View Post
While you are doing the test, switch the AC/heater controls all around. There are at least 2 vacuum controlled dampers.
these????
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Old 10-24-2011, 06:56 PM   #6
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Ford Contour LX P0171


Check for cracked boots on any breather tubes on the valve covers. This will cause unmetered air from the maf sensor and not cause driveability issues.
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Old 10-25-2011, 07:53 AM   #7
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these????
Yeah that's what they look like.
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Old 10-31-2011, 09:47 PM   #8
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Ford Contour LX P0171


Quote:
Originally Posted by Maintenance 6

Yeah that's what they look like.
Last but least the one thing that most of the time that causes this code with idle search. Would be the mass air flow sensor.. Check the air fuel correction with the 0/2 sensors.. I'm sure you will find the problem will be the MAF.. It will need to be replaced..

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