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Thread: Oxygen sensor relay location

  1. #1
    Join Date
    Jun 2007
    Location
    Des Plaines, Illinois
    Posts
    26

    Default Oxygen sensor relay location

    I'm chasing down a rough idle problem and as I'm running down the list of possible causes (and since I already replaced my O2 sensors with no change), I wanted to test the relay to the sensors, I found the diagram and chapter in the Bentley about this, but my e-box looks a bit different than the diagram, and I can't tell which relay is the one I want.

    What's the color of the relay, or what is the best way to figure out which it is?
    Trace the wires back to the relay...or is there an easier way?


    Thanks in Advance
    Jim

  2. #2
    Join Date
    Apr 2006
    Location
    Chicago, Il. U.S.A.
    Posts
    4,243

    Default

    I THINK it's the furthest outboard. To confirm it the wire colors to it are red/wht brn/blu grn/vio red/blu
    Hope this helps
    "The gas pedal wouldn't go to the floor if it weren't meant to be there"

  3. #3
    Join Date
    Jun 2007
    Location
    Des Plaines, Illinois
    Posts
    26

    Default

    Perfect Thanks!
    Now if I would have thought to ask this yesterday when it was slightly warm out...

    jim

  4. #4
    Join Date
    Mar 2006
    Location
    East Brunswick, New Jersey
    Posts
    879

    Default

    Are you sure the O2 sensor has a relay? The o2 sensor actually generate a weak voltage when working. It is not used to switch on any other electrical device, is it?
    '01 540it, 6/01
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  5. #5
    Join Date
    Jan 2004
    Location
    Thunder Bay, Ontario
    Posts
    2,538

    Default

    Quote Originally Posted by Ross
    I THINK it's the furthest outboard. To confirm it the wire colors to it are red/wht brn/blu grn/vio red/blu
    Hope this helps
    You are correct sir



    Dave M

    10/90 Build 525im, 630,000+km, Eibach/Sachs, Engine Rebuild
    *RIP Oskar the DOG *

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