Check engine code PO171
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This is a discussion on Check engine code PO171 within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Need a bit of help. This check engine light has been on for quite some time and tried over and ...

  1. #1
    Registered User Bumblebee92's Avatar
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    Check engine code PO171

    Need a bit of help. This check engine light has been on for quite some time and tried over and over ago to have this code disappear. I recently had a catalytic converter replaced on the up pipe for my 03 Subaru WRX. So I'm thinking its a leaky weld or possibly a faulty MAF sensor. But I'm not exactly sure on how to check for these faults. Please help. Thank you. I do have a picture of the diagnosis print out but can't figure out how to post it here for additional help

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    Registered User wreckingball man's Avatar
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    Check out the link down in my signature...it's a pretty hard code to track down. Good luck with it lol.

  4. #3
    He simply abides. SD_GR's Avatar
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    In the link in Wrechingball Man's sig, I'd do this order:

    5. + 3. together.
    1.
    The rest numerically. So do (5+3) together first from the list, then look at 1., then just go down the list.
    WRX Info Links, Courtesy TheJ
    Man is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis Zorbas
    I lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
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    Registered User wreckingball man's Avatar
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    ^I'll edit that into the thread, thanks SD.

    And OP, the numbers aren't exactly the order you should do things in. I just listed them off the top of my head. Also, I have a link to the P0171 thread on NASIOC in my appendix if you wanna check that out too.

  6. #5
    He simply abides. SD_GR's Avatar
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    Hi Wreckingball, I only mention it because the few times I've run into PO171 (less than five times total in my life to be honest) that order got it fixed. Hopefully the OP will be just as fortunate. The trouble is once you're down the list things get more and more sketchy. MAF+intake cleaning seems like a nice cheap way to start and could be a popular fix with any luck though.
    WRX Info Links, Courtesy TheJ
    Man is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis Zorbas
    I lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
    DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

  7. #6
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    Hi,
    I had the same code on my 06sti a little while ago. The dealer indicated the code stood for running lean. They tightened a clamp on a hose and now it runs better no engine light anymore. Look for loose hoses or clamps on hoses. hope that helps

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