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  1. #1
    Established Member Two Rings jpo's Avatar
    Join Date
    Jun 22 2008
    AZ Member #
    30184
    Location
    Calgary

    Bad O2 sensor. Which Side

    Hi, I have a bad rear O2 sensor and am going to order it online. However I don't know which side and all the online parts places sell them labeled as left or right units. Here are the trouble codes:

    16440 - O2 Sensor B2 S2 P0056 - 004
    17548 - O2 Sensor B2 S2 P1140 - 004

    So B2 = Bank 2? S2 = Side 2?

    Does anyone know if I am dealing with the left or the right?

    Much obliged.

    John
    2004 Moro Blue S4 MT

  2. #2
    Account Terminated Four Rings
    Join Date
    Oct 26 2009
    AZ Member #
    49779
    Location
    Beaver Creek, CO

    If I recall correctly, bank 2 is the right side, and sensor 2 is post cat. I had my bank 1 side 1 go bad on my 3.0 and it was the driver side, precat.

  3. #3
    Established Member Two Rings nfs1000f's Avatar
    Join Date
    Sep 22 2010
    AZ Member #
    64703
    My Garage
    1987 Honda Hurricane 1000. Gone: 1986 4000, 2001 A6, 2005 B7 S4
    Location
    VESTAL, NY

    Quote Originally Posted by Greedo View Post
    If I recall correctly, bank 2 is the right side, and sensor 2 is post cat. I had my bank 1 side 1 go bad on my 3.0 and it was the driver side, precat.
    IIRC it is the other way. Bank 1 is passenger, Bank 2 is driver's.

  4. #4
    Veteran Member Four Rings jfunkey's Avatar
    Join Date
    Jan 21 2009
    AZ Member #
    37747
    My Garage
    R32 B7/S4....2000 2.7t gone :(
    Location
    putting you into the wall

    Quote Originally Posted by nfs1000f View Post
    IIRC it is the other way. Bank 1 is passenger, Bank 2 is driver's.
    yes bank two is the driver side sensor two is the back sensor.

    The reason bank two is the driver side is because of the fireing order.. Cylinder one is on the passenger side
    JHM war machine. Total transformation. JHM/Tune/headers/intake manifold.
    My B7S4. Faster then my old RS4 and First B7 S4 in the 12's

    AMA member
    USMC member (active)
    Facts first member. Built and supported by many

  5. #5
    Established Member Two Rings jpo's Avatar
    Join Date
    Jun 22 2008
    AZ Member #
    30184
    Location
    Calgary

    Perfect. Thanks all.
    2004 Moro Blue S4 MT

  6. #6
    Account Terminated Four Rings
    Join Date
    Oct 26 2009
    AZ Member #
    49779
    Location
    Beaver Creek, CO

    I knew I should have looked for the paperwork that had it on them. First was one sensor and last week I found out it was the other (hence my confusion of which was which). Now it's my B1S1 that's gone bad, B2S2 was first.

    My bad!

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