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Thread: oxygen sensor 1 is bad which do i replace

  1. #1
    Join Date
    May 2006
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    65

    Default oxygen sensor 1 is bad which do i replace

    i have to replace sensor one but i dont know which one it is. Where can I find out? I left my bentley at home!

  2. #2
    Join Date
    Mar 2006
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    East Brunswick, New Jersey
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    Default

    One is the driver side I believe.
    '01 540it, 6/01
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    '10 535ix. 9/09
    '10 mini 6 speed
    '15 mini countryman 6 speed

  3. #3
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    Dec 2003
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    baton rouge, loserana
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    i am reasonably sure it's the left side, but i wouldn't just do one
    all america wants is cold beer warm cat and a place to take a poop with a door on it

  4. #4
    Join Date
    Nov 2006
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    Vancouver, BC
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    Okay, this is what I've been told by others on this forum.

    If it's been more than 50,000 miles since they've been changed, then you should do them. If one is gone, the other likely is, or is close to it to.

    So do both, it's worth it.

    And to buy it, here's a link for you to find them at a decent price. Someone else had also given me this link.

    http://www.pelicanparts.com/BMW/cata...EXHmuf_pg2.htm

    Enjoy.
    1995 540i E34 Green V8 4.0L Auto Style 5's 200,000 KM's

  5. #5
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    Oct 2006
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    i would do both at the same time as well. They arent too expensive but I have a question. Dont mean to thread jack but on V8 models if you switched the connectors for the 02 sensors would it kick off a check engine light? reason is because I did tranny mounts and had to disconnect 02 sensors to get to them.

  6. #6
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    Mar 2006
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    USA
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    shouldnt throw any error, unless the engine has problems, then you could have some new more serious problems.
    Alusil, Dinan DME | ITG Air Filter | Eibach/Bilstein HD | 26/20 Swaybars | Iridium plugs | Depo/ProLumen HID | Optima batt. | no AC | Stoptech brake lines, Frozen rotors, brass bushings, Superblue

  7. #7
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    it would definatly piss it off, if you look at how the wires are run you can see which one is which, the computer adjusts the mixture separately for each bank of the motor, it would probably set a 02 control code for both sensors but not before screwing up the short term fuel trims, resettable on obd I cars by killing the battery

    Quote Originally Posted by markus
    i would do both at the same time as well. They arent too expensive but I have a question. Dont mean to thread jack but on V8 models if you switched the connectors for the 02 sensors would it kick off a check engine light? reason is because I did tranny mounts and had to disconnect 02 sensors to get to them.
    all america wants is cold beer warm cat and a place to take a poop with a door on it

  8. #8
    Join Date
    Jan 2004
    Posts
    4,148

    Default Ditto, what Winfred said. It will definitely throw a code and won't run

    correctly.



    Quote Originally Posted by winfred
    it would definatly piss it off, if you look at how the wires are run you can see which one is which, the computer adjusts the mixture separately for each bank of the motor, it would probably set a 02 control code for both sensors but not before screwing up the short term fuel trims, resettable on obd I cars by killing the battery


  9. #9
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    Oct 2006
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    alright kool. just making sure i didnt screw anything up.

  10. #10
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    i have a couple miles on the originals and still need to sort the front throttle body gasket before I change mine.

    lets see what a new one does... *patiently waits*
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

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