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Thread: 745i Wideband O2 Sensor Location

  1. #1
    Join Date
    Nov 2009
    Location
    SF Bay Area
    Posts
    218
    My Cars
    E34 M5, e23 745i

    745i Wideband O2 Sensor Location

    What's the optimum location for tapping in a wideband O2 sensor to the stock downpipe? At the collector, or further up/downstream?
    1993 M5 Canadian
    4.0L stroker

    1984 745i

  2. #2
    Join Date
    Oct 2007
    Location
    Valley Village, CA
    Posts
    624
    My Cars
    1985 745i

    745i Wideband O2 Sensor Location

    Aem specs ~18” from turbo
    When your enemy is making a mistake, do not interrupt him.

  3. #3
    Join Date
    Dec 2005
    Location
    Melbourne, Australia
    Posts
    1,903
    My Cars
    E24, E34 x2, E36
    If it has a cat just downstream of it or just downstream of where the merge is (if u have one ) so it reads good. Make sure it’s in the top section or at least 30deg up from parallel with the road as this will keep the condensation water out of it.

    Cheers
    BMW’s
    90 E34 M5
    84 E24 M635csi standalone ecu with coil on plug
    94 E34 540i/6 SC 5-17psi Flex fuel/standalone ecu
    97 Z3 2.8
    97 E36 M3 euro SC still u/c


    OTHERS
    11 Audi S5 APR stg2
    19 Volkswagen Amarok V6


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