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low circuit

This is a discussion on low circuit within the Computer & Tuning forums, part of the LSx Technical Help Section category; 2 months after the header installation n tune..ses light came on..checked it...came out as the o2 sensors have a low ...

  1. #1
    Senior Member 35thAnniZ28's Avatar
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    low circuit

    2 months after the header installation n tune..ses light came on..checked it...came out as the o2 sensors have a low circuit...it turns off one day..then the next comes on....would any of these cause the problem
    1.24'' o2 extensions instead of 12''
    2.ntk o2's....

    im not sure if the aftermarket o2s i got from summit are junk or if the extensions are too damn long...any help?

    right now it smells like fumes at a stop light..if i do end up fixing this problem..would it still smell like it?? *no cats -long tubes

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    Veteran 0rion's Avatar
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    do you remember the actual code? There are a couple that just come with headers on some/most cars. The smell also comes with no cats and LT's. See if you can get the actual code. That may get you more responses. Heater codes and switching codes sometimes just come with LT's due to the O2's being further downstream than the stock locations.

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    Senior Member 35thAnniZ28's Avatar
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    yeah true that..ill get it checked once it comes up again...but it comes n go's...

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    Senior Member 35thAnniZ28's Avatar
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    just got back from advance..the code is p1133(fuel air metering)...at first i thought it was the o2's/...but i guess not..does anyone know what this is?

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    Senior Member 35thAnniZ28's Avatar
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    ok...so ive done some research..
    "P1133 Heated Oxygen Sensor (HO2S) insufficient switching bank 1 sensor 1 (Rear Bank) "
    is what i found..


    .would having 24'' extensions on both sides for the front 02's make any difference...rather than having 12"?

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    Senior Member 35thAnniZ28's Avatar
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    would a header/exhaust leak cause this?

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    TunedbyFrost.com Tuner Frost's Avatar
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    Without your own scanner it's hard to tell if that one is going bad, or there just isn't enough heat at low RPMs because of your headers that is causing the code.

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    Senior Member 35thAnniZ28's Avatar
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    would relocating the bunges to the other side of the header help things out instead of having them on the outside?

  9. #9
    TunedbyFrost.com Tuner Frost's Avatar
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    Just like my post above says, with no way to log them, there is no sure way to tell exactly what the issue is. You could start with a fresh set of O2s though; that's never a bad thing.

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    Senior Member 35thAnniZ28's Avatar
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    yeah true that..well i just got these o2's not too long ago..but would this hurt performance? and would this make the tuner unable to tune once i get the h/c setup?

  11. #11
    Moderator Firebirdjones's Avatar
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    I think what Frost is hinting at is that maybe you have a lazy 02 sensor. The only way to tell for sure is to log,,,and watch that 02 and how it is acting,,,switching back and forth etc....
    You would need a scan tool for that,,,or tuning software of some sort.

  12. #12
    TunedbyFrost.com Tuner Frost's Avatar
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    If they are pretty new and you are getting that code, it's likely just from heat loss at the O2 caused by running headers instead of the old cast iron manifolds. Many mail order tuners actually turn off error reporting for this code.

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    Senior Member 35thAnniZ28's Avatar
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    ehh..true that..which programmer should i buy ..crane? super chips?

  14. #14
    TunedbyFrost.com Tuner Frost's Avatar
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    I recommend leaving handhelds on the shelves... mail order tunes are about $125-150 which work well if you have boltons, and if not, buy HPT and tune yourself. Sounds like I am giving away business, but that's my 2cents.

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    Senior Member 35thAnniZ28's Avatar
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    alright thanx alot man

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