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Thread: Constant 02 sensor codes

  1. #1
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    Default Constant 02 sensor codes

    I've been running LT's for a couple of years now with occasional codes. Lately, they have been popping up every day or two. I tried a new Denso and swapped it from side to side, but if anything, it was worse than the stockers. My fuel trims are fairly high, my exhaust smells rich, and my mileage is crappy.

    Three questions:
    1. Would lowering the O2 switch points possibly help?
    2. In order to run OLMAF, do I have have to do anything besides raise the CL temp enable (B4205) and disable fuel trims (B3801)? My cat protection (B0701) is already off.
    3. Is editing the B3605 OL Commanded Fuel advisable?

    Thanks for any guidance.
    Last edited by RevGTO; April 30th, 2009 at 11:31 AM.

  2. #2
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    http://forum.efilive.com/showthread.php?t=9932
    try this.......
    Its all about heat/temperature of the O2 sensor

    top secret though don't tell anyone
    Very very common problem with fitting Long tube headers and big bore exhausts. Just google it
    We had a customer a couple of years ago referred from another workshop with this exact problem after THEY had fitted 2 sets of new o2 sensors after a new exhuast > opps. We actually got the new o2's to fire up after a few hard km's to get some heat into them. Fit the lower ohm bosch universal replacements problem fixed. Customer happy!
    Mike
    Last edited by The Alchemist; May 6th, 2009 at 08:04 PM.
    "Just a tune > yeah right !!!! "

  3. #3
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    What ones are 2-4 ohms? A lot of guys on LS1tech have used Bosch 13111 rear Corvette sensors on the theory that the rears are hotter, and have had poor results. I did the same with a Denso rear it was no help.

    My question was about tuning because I've come to the conclusion that these O2's just aren't going to work - regardless of brand/type.

  4. #4
    Lifetime Member mr.prick's Avatar
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    Why not set the DTC to no mil?
    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

    _________________________________________________

  5. #5
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    Because the real problem is not that it's throwing codes, it's that fueling isn't right because the O2's aren't doing their job properly.

    Wish I could get some "feedback" on my tuning questions ...

  6. #6
    Lifetime Member mr.prick's Avatar
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    Is COT on?
    Any DTC's?
    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

    _________________________________________________

  7. #7
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    Quote Originally Posted by RevGTO View Post
    What ones are 2-4 ohms? A lot of guys on LS1tech have used Bosch 13111 rear Corvette sensors on the theory that the rears are hotter, and have had poor results. I did the same with a Denso rear it was no help.

    My question was about tuning because I've come to the conclusion that these O2's just aren't going to work - regardless of brand/type.
    http://forum.efilive.com/showthread.php?t=10223

    http://www.bosch.com.au/content/lang.../Section_C.pdf
    page 31 about 3/4 the way down the page
    P/N 0-258-965-505
    its on this post....
    Cheers,
    Mike
    "Just a tune > yeah right !!!! "

  8. #8
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    Quote Originally Posted by mr.prick View Post
    Is COT on?
    Any DTC's?
    COT is off. Just now I pulled two P0135 low voltage codes on Bank 1 from the car. That's my most common one - I get it sometimes on Bank 2 also. I get most of the O2 related codes at one time or another. I set the DTC's for "insufficient switching" (1133 & 1153) to noMIL.

    This was an occasional issue until I installed a better flowing I-pipe and muffler. Neither the Y-pipe or anything near the O2's was touched. But the pace of the codes really picked up.

  9. #9
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    Quote Originally Posted by The Alchemist View Post
    P/N 0-258-965-505
    its on this post....
    Cheers,
    Mike
    That P/N is not on that page, or elsewhere in the catalog as far as I can tell. There is a 258-986-505. Would that be it?

  10. #10
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    what was I thinking ! .......yes its 986 not 965
    0-258-986-505 its an 18w heater instead of the standard 12W heater....
    Give them a go, they'll work a treat...
    Still top secret though
    Thanks
    "Just a tune > yeah right !!!! "

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