Thread: trouble code po171 bank 1

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  1. #1 trouble code po171 bank 1 
    peter
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    Default 08-11-2012
    what is this code my son said senserox
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  2. #2 Re: trouble code po171 bank 1 
    Explicit_Spade
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    Default 08-11-2012
    Your upstream o2 sensor is reading a lean condition.

    OBD-II DTC: P0171 System Too Lean (Bank 1)
    Quote Originally Posted by W-Body Store
    Remember, GM engineers didn't take into account your need for speed.
    Daily Driver: 06 Grand Prix GT / 9.4:1 CR / IS3 Heads / Ported Gen V / ZZP Headers / HPT Pro / Pulleys: 4.25, 3.8, 3.5, 3.4, 3.2, 3.0, 2.9, 2.7
    Projects: 86 Monte Carlo SS / 98 Sonoma / 74 Honda CB750
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  3. #3 Re: trouble code po171 bank 1 
    dsmuts
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    Default 08-11-2012
    You most likely have a vacuum leak
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  4. #4 Re: trouble code po171 bank 1 
    Fivefingerdeathpunch
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    Default 08-11-2012
    yup. vacuum leak.

    Check over all vacuum lines for the problem.

    SMGPFC Member #1
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  5. #5 Re: trouble code po171 bank 1 
    peter
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    Default 08-12-2012
    do you know where to get vacuum diagram for 2004 grand prix i checked librarys. thank you
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  6. #6 Re: trouble code po171 bank 1 
    dsmuts
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    Default 08-12-2012
    Should be one under the hood.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  7. #7 Re: trouble code po171 bank 1 
    SDGTP99
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    Default 08-12-2012
    Google Image '2004 Grand Prix Vacuum Diagram'
    OverKilled, HAI, Ported Throttle body, Ported intake, ZZP DP, Magnaflow, BMR ta's, GMPP STB's, CCS springs, tinted tailights, roof rails, TEP cool'r, G8 hood. Glass Gearbox.
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