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Help! Po171,po174 Lean Codes

This is a discussion on Help! Po171,po174 Lean Codes within the General Help forums, part of the LSx Technical Help Section category; I had this pop up the other day while driving, 85+ degrees out and I did have the air on ...

  1. #1
    MOTOR CITY MARO' SSTODD's Avatar
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    Help! Po171,po174 Lean Codes

    I had this pop up the other day while driving, 85+ degrees out and I did have the air on for awhile but it was off when it happened. I had it cleared and it has not come right back yet. I had this pop up once last year also and cleared it. What do you guys think? Is it the maf, Be gentle with me

    2000 SS A4 18,000 miles
    lid, bellows, slp maf, ngk plugs, msd wires, free mods, S3 T.B., slp cat-back, kn air filter.

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    Member bevenue's Avatar
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    Navy Blue Metallic
    2001 camaro SS A4

    Mine had those codes before. It was a hole in the PCV line next to the intake.
    [SIGPIC][/SIGPIC]
    SS #2988, A4, Navy Blue Metalic, 335HP Dual Dual Exhaust, Chrome 10 spokes, Floor mats, Dash plaque, and SS Grille
    Best ET 13.08 @ 106.1, 2.00 60', with SLP lid

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    MOTOR CITY MARO' SSTODD's Avatar
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    Any other ideas out there.

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    Member stanger88's Avatar
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    Black on black.
    2001 WS6 M6 (stock)


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    Z two the 8 JonD99's Avatar
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    Black
    1999 Chevy Camaro Z28

    That code popped up a few times in my Z too. But last year i got o2 sims and swapped out my front o2's and i haven't thrown that code since, FWIW.

  6. #6
    Senior Member slims00ls1z28's Avatar
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    2005 GTO M6 Black
    2000 Z28 A4 Red

    Bad O2 sensors can shoot those codes as well as bad cats.

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    www.gearchatter.com/viewtopic9039.php Wouldn't worry about it unless they keep coming back.

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    Member stanger88's Avatar
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    Black on black.
    2001 WS6 M6 (stock)

    Quote Originally Posted by slims00ls1z28 View Post
    Bad O2 sensors can shoot those codes as well as bad cats.
    So can exhaust leaks right before an O2, as was my case.

  9. #9
    MOTOR CITY MARO' SSTODD's Avatar
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    Thanks everyone, I swapped my stock maf in and took the slp out. I am going to see if I see any more codes. I wish I had read all the threads on not buying a maf over a year ago when I did buy it.

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