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Thread: Oxygen sensor location

  1. #1
    Join Date
    Sep 2008
    Location
    selah WA
    Posts
    218
    My Cars
    1996 m3

    Oxygen sensor location

    Couldn’t find it in google and figured maybe someone else would like to know as well. Where is the ideal location for bank 1 o2 sensor and wide band bung in the downpipe.

    I’m conflicted with a lot of builds that seem to be 12” or less from turbo but AEM instructions say no closer than 36”. As for o2 for bank one I couldn’t find any reference. Assumption is similar distance for longevity. If that’s the case should they be opposite sides or separated?


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  2. #2
    Join Date
    Aug 2015
    Location
    Crystal Lake, IL
    Posts
    99
    My Cars
    1996 BMW 328i Sedan
    OP, great question. I’m curious to know too. I’m just about to drill my downpipe and weld the bungs.

    Currently I have them both laid out about 18” from the turbine housing close to the firewall.

    The wideband is at about 2 o’clock and the Bank one sensor at about 10. They’re staggered by a few inches.


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  3. #3
    Join Date
    Feb 2011
    Location
    Virginia
    Posts
    3,043
    My Cars
    97' m52 turbo
    18" works orientation shouldn't matter as much - staggering them wouldn't hurt.

    Main thing is distance, which you have figured out and also making sure the sensors are on the top part of the pipes. This way if blow by occurs (oil in exhaust, coolant, or whatever) doesn't contaminate the sensors as easily if fluid where to run down the exhaust

  4. #4
    Join Date
    Jan 2016
    Location
    Littleton, Co
    Posts
    109
    My Cars
    E36 S52 M3/4/5 Cos. Blk.
    I’ve got the o2 sensor about 10” from the turbo. (Can’t remember why i put it there though) The afr is mounted near the transmission mounts. This is with an spa manifold.
    '97 BMW M3/4/5, Cosmos Black.

  5. #5
    Join Date
    Feb 2012
    Location
    Birmingham, Alabama, USA
    Posts
    8,369
    My Cars
    1995 BMW M3
    Ive got my AEM sensor about 36" from the turbo.
    I doubt its that crucial.. However, following the manufacturers instructions is always the best bet. If AEM says 36" … Put it 36" away.

  6. #6
    Join Date
    Aug 2015
    Location
    Crystal Lake, IL
    Posts
    99
    My Cars
    1996 BMW 328i Sedan
    I stand corrected: the SCG-1 installation manual says to mount the WB at least 24” after the turbo. Good thing I haven’t drilled any holes yet-rtfm, right ?


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