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Thread: Rear 02 sensor error

  1. #11
    Well to update with current status.
    A few days after I last posted, as my clocks rolled over to 80000km, my speedo and odo stopped
    working. I followed google and removed the sensor. It had very little grey matter, but I cleaned
    it up, replaced it, and also cleaned and reseated the 3 pin connector.
    Since that day I have had a working speedo/odo and also never seen an O2 error again....

    Then yesterday on my way home, I had a brief engine stumble along with the CEL come on
    for about 2-3 seconds and then all returned to normal.
    A quick check when I got home showed no error stored and an AFR of 95,6 .
    All other tests passed and nothing "seems" out of place.
    So my question would be, is this then a sign of a failing fuel pump, or
    should I be looking elsewhere. ?
    I could run live data on the Buelltooth, but I honestly wouldnt know
    what to be looking for.

  2. #12
    Senior Member 34nineteen's Avatar
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    Quote Originally Posted by Beebop View Post
    Well to update with current status.
    A few days after I last posted, as my clocks rolled over to 80000km, my speedo and odo stopped
    working. I followed google and removed the sensor. It had very little grey matter, but I cleaned
    it up, replaced it, and also cleaned and reseated the 3 pin connector.
    Since that day I have had a working speedo/odo and also never seen an O2 error again....

    Which sensor?

  3. #13
    Senior Member Cooter's Avatar
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    I think he means O2 sensor.

    One small stumble and no clue to why means ignore it, or the depth of that wormhole knows no end. You can LOOK for things though. Wash it, wax it, look at what you're doing. Its a good way to see your own bike up close while doing the Lords work. Even take the airbox off and LOOK closely at everything. Your AFV is fine 90-110.

  4. #14
    Sorry wasnt clear.
    the speed sensor was removed and cleaned.
    I have not yet touched the O2 due to its location
    and basic lack of time on my side.

  5. #15
    Well its been a while, and honestly no progress on this.
    After not finding anything obvious, I bought a new O2 sensor
    yesterday and fitted it. When for a run today, and exactly the same symptoms.
    Constant speed above 120kmph for a few km's and the light comes
    on again. I usually drop speed down to 100 or so when this happens.
    The CEL stays on for 3 or 4 minutes and goes off again.
    The bike runs so well its hard to imagine there is anything
    else wrong or failing. I really need to fix this as I have a potential buyer, and
    I wont sell it in this condition. It has to be right. If I had a fuelling issue
    I would expect to see a Lean or Rich error, but its always inactive.
    Could another sensor such as Temp be causing the ECM to kick out
    this error ?
    All suggestions welcome.

  6. #16
    Well my own question was answered yesterday when my fuel pump kicked the bucket.
    I managed to nurse it home spitting and farting, dying at every opportunity.
    Hopefully the replacement will be the end of my problems.

  7. #17
    Senior Member Cooter's Avatar
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    Go OE or PM Barrett for quality fuel pumps and re-build kits.

    Do NOT get the cheap stuff off e-bay. It is wrong.

  8. #18
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    I can attest to Rev-Mo's pumps (Walbro): https://www.rev-mo.com/fuel

    And I'm pretty sure others can speak to Aagaard's: https://aagaardmotofoundry.bigcartel...xb-motorcycles

    This is just in case Barrett is out...he probably ain't, but you know, just in case.

  9. #19
    Well despite my fuel pump biting the dust, the replacement thereof and also replacement of the
    filter while I was in there, was a short lived reprieve. I got to the stage where the bike stood and I was using
    my R1200RS exclusively. Not ideal as commuting is not what I bought it for.

    So to date this rabbit hole has cost me:
    1 x 02 sensor
    1 x fuel pump
    1 x fuel filter.
    2 x plugs

    Still getting Rear 02 sensor inactive error code, and poor performance.
    This week I decided to test my patience a bit more, so I pulled apart and
    tested all wiring and connectors with a meter, and cleaned out each connector with
    cleaner. Also took apart all the ground points, cleaned them up with fine sand paper
    and electrical cleaner.
    Took it for a run, and this time it came back with 2 extra codes:
    Temp sensor short to ground
    Fuel pump short to ground

    I put all my collective brain cells together and came up with...... nothing..
    I have always figured this to be a fueling rather than electrical issue, so
    I did what any self respecting husband would. I swapped out my fuel pump assembly
    with my wife's. She has the '05, mine is an '06.
    And would you believe it, problem resolved.
    Done just over 100km's so far and not so much as a miss or cough.
    So I have a new fuel pressure regulator on its way for my wife's bike.
    (She can have all the new parts).
    This should conclude this season of "dealing with a frustrated Buell owner".
    I can now close this thread as "resolved".
    Thanks for everyone's input, I thought I'd just post this incase someone
    ever deals with a similar set of symptoms, and doesnt want to lose as much precious hair
    as I have.

  10. #20
    Senior Member Cooter's Avatar
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    I'm glad you got lucky.



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