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Thread: O2 Sensor Questions

  1. #1
    Tuner in Training Bumblebee06's Avatar
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    O2 Sensor Questions

    I recently had LG Pro headers put on my C6 but didn't have the o2 sensors at the time. I had stumbled on a post that had a walkthrough on how to disable them and did so with success. This is on an LS2, A6, 2006

    Now I have the front two sensors in and working but they are still disabled via the the tune.

    I do not want to reinstall the rear ones if I don't need too so question one is does this pose a problem to the ecm to only run off the front two?

    Can anyone tell me the optimal way to enable the front ones while still leaving the rears off? I know the DTC's with Bank 1 need to be enabled again but looking for any additional help anyone can throw my way.

    Sidenote if anyone can point me to that elusive post that I can't seem to find the correct search words that discussed this topic that would be great.

    Thanks!

  2. #2
    Senior Tuner DSteck's Avatar
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    Disable any code that references the Sensor 2 stuff. When I get home, I can e-mail you the file from my friend's 2005 so you can see the codes that are disabled. Leave SES Enable checked, but set them to 3.

    There's no problem to turning off the rear O2 sensors. The only purpose they serve is to monitor catalyst efficiency. If you don't have cats anymore, then there's no point in having the rear sensors. Only your fronts provide input for fueling adjustments.

    FYI, check your PMs on Speed.

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  3. #3
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    To disable COT and the Rear O2s:

    Engine, Fuel Control, COT, Lean Cruise, Cat Over Temp Protection:

    COT - Set to Disabled

    Engine Diag, General, Catalyst:

    Catalyst Test - Set to Disabled
    Post O2, Post O2 Test - Set to Disabled

    Engine Diag, DTCs:

    Set all the below DTCs to Error Mode "3 - No Error reported".

    P0036
    P0054
    P0056
    P0060

    P0137
    P0138
    P0140
    P0141
    P0157
    P0158
    P0160
    P0161

    P0420
    P0430

    P2A01
    P2A04
    Last edited by RWTD; 09-09-2009 at 05:09 PM.
    RWTD
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  4. #4
    Senior Tuner DSteck's Avatar
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    I thought unchecking SES Enable didn't allow the readiness checks to complete.

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  5. #5
    Senior Tuner
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    That's possibly true. I've never attempted to verify this.
    RWTD
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  6. #6
    Tuner in Training Bumblebee06's Avatar
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    Thank you!

  7. #7
    Senior Tuner DSteck's Avatar
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    Quote Originally Posted by RWTD View Post
    That's possibly true. I've never attempted to verify this.
    I'll try it this weekend when I tune my buddy's 05 Corvette. I only vaguely remember reading about it.

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  8. #8
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    I know I'm bringing back an old post, but was the verdict? My inspection will be in a few months and I've got the rear 02's turned off by setting all of the DTC's described above by setting them to: 3-No Error Reported, but I have SES Enable unchecked . So far everything seems fine, just want to make sure it's ok for inspection. Is there an easy way I can test it myself?

  9. #9
    Senior Tuner DSteck's Avatar
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    Just check your readiness monitors in the scanner.

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  10. #10
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    Hey guys sorry to bringing this thread back, but I have a question will this setup work for a 2006 gto, I went ahead and disabled my o2s I unchecked the box and change to no error 3, disabled cot, but on the status bid It shows that its on. That can't be true since one of the rear o2 is not even there, its plugged off.

  11. #11
    Senior Tuner DSteck's Avatar
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    The status bit shows that what is on?...

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  12. #12
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    Quote Originally Posted by DSteck View Post
    The status bit shows that what is on?...
    The rear o2s

  13. #13
    Senior Tuner DSteck's Avatar
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    The PCM is still going to try and activate the sensors... they just won't throw any codes.

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  14. #14
    Advanced Tuner Niemer's Avatar
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    Don't set COT to disabled if you have DOD/AFM and you want to use it. Just set the enrichment to 1.000 and max out the enable temp. table.