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Thread: p0171, but never lean on wideband

  1. #1
    Advanced Tuner
    Join Date
    Apr 2008
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    214

    p0171, but never lean on wideband

    i dont get it.. i went back to stock, had to put in some new sensors, and then after a week i start getting a lean code, but its NEVER lean so i dont understand.

    do i have to maybe change the lean/rich values a bit higher and lower in the fueling/o2 tables (e67 pcm) and should this ever even have to be done?

  2. #2
    Advanced Tuner Japeatr's Avatar
    Join Date
    May 2010
    Location
    Dallas Texas
    Posts
    321
    check your MAF scaling

    384whp/303wtq
    Built 2.0LSJ: TVS w/2.6, 1000cc, Stage 2 cams, custom fuel system, E85, Dual Pass, 3"intake, 3" Catless exhaust, CIA midlength Header

  3. #3
    That code pops up when your trims pass a certain point to maintain stoich. You may never see lean on your wideband, but it is adjusting the fueling so much it throws a code.

    Check your trims.

    Kevin

  4. #4
    Advanced Tuner
    Join Date
    Apr 2008
    Posts
    214
    awesome.. thats what i thinking.. my trims are wayy outa line right now.... i knew that from when i put the stock tune back on with the full exhaust... i just didnt think it would throw a lean code...

    thnx