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  1. #1
    Active Member Three Rings AwdOwns's Avatar
    Join Date
    Aug 17 2008
    AZ Member #
    32063
    My Garage
    2015 Audi S3. 2009 Bmw M3.
    Location
    PNW

    Dead O2 Sensor or?

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    My car hasn't been running the best (boggy and lacking power) so me and a friend logged my 02's and came up with this. Any friendly input is appreciated.
    I noticed that Bank 1 sensor 1 is flatline. Is that normal?
    Last edited by AwdOwns; 10-13-2010 at 08:50 PM.
    E92 M3 (tune,pulleys,i/e,suspension etc)
    8V S3 (sold)
    C4 S4 (sold)
    B5 S4 (sold)
    B6 S4 (sold)
    C5 A6 (sold)

  2. #2
    Veteran Member Three Rings
    Join Date
    Feb 02 2009
    AZ Member #
    38212
    My Garage
    Cars other people killed
    Location
    capital city wastes

    no its not normal for a bank 1 o2s to read flatline. means its either disconnected or broken. it will cause a whole bunch of poor driving issues. on your graph the flatline is colored as bank 1 specified which doesnt make sense because the computer would never request a flat reading. and for the the other readings while its hard to say just off of o2 readings it looks like you have a vac leak or two as well. ontop of a non working o2 sensor which should be giving you a b1 s1 o2 sensor no activity code.
    where in wa are you located?

  3. #3
    Established Member Two Rings BITURBOB5's Avatar
    Join Date
    Apr 24 2008
    AZ Member #
    28056
    My Garage
    01.5 S4
    Location
    Harrison

    I got a set of used 02s for sale

  4. #4
    Active Member Three Rings AwdOwns's Avatar
    Join Date
    Aug 17 2008
    AZ Member #
    32063
    My Garage
    2015 Audi S3. 2009 Bmw M3.
    Location
    PNW

    Quote Originally Posted by megafreakindeth View Post
    no its not normal for a bank 1 o2s to read flatline. means its either disconnected or broken. it will cause a whole bunch of poor driving issues. on your graph the flatline is colored as bank 1 specified which doesnt make sense because the computer would never request a flat reading. and for the the other readings while its hard to say just off of o2 readings it looks like you have a vac leak or two as well. ontop of a non working o2 sensor which should be giving you a b1 s1 o2 sensor no activity code.
    where in wa are you located?
    Didn't think so. I bought a new 02 and made sure everything was plugged in correctly and i'm pretty sure i'm still having the same issue but haven't been able to log yet (Will tomorrow).
    Its weird that I have no CEL's either. As for Vacuum leaks ive pressure tested and pretty sure I got em all taken care of. Doesn't hurt to go back over that so I will do that as well.
    Are their any specific block's I should log? Timing,Knock,O2 voltages,Fuel trims etc??
    E92 M3 (tune,pulleys,i/e,suspension etc)
    8V S3 (sold)
    C4 S4 (sold)
    B5 S4 (sold)
    B6 S4 (sold)
    C5 A6 (sold)

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