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headers and ecu

This is a discussion on headers and ecu within the Computer & Tuning forums, part of the LSx Technical Help Section category; What is it about headers that cause the check engine light go on in a car. Is it the rear ...

  1. #1
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    headers and ecu

    What is it about headers that cause the check engine light go on in a car. Is it the rear O2 sensor that doesn't like the oxygen reading when the fuel/air exhaust comes through at a higher flow rate? Or does the rear O2 sensor just monitor the functionality of the cat, which may be "failing" to do it's job due to the headers?

    Thanks.

  2. #2
    Senior Member mrr23's Avatar
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    did you remove the cats? if so, then there will not be difference in front to rear o2s outputs. this causes a check engine light. doesn't affect drive ability.

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    I haven't done anything yet...I'm trying to get an idea of what causes the check engine light to go on. I live in a state where if that's on, it won't pass inspection and I've heard that putting headers on or upgrading your exhaust will cause the SES light to come on. If I have the rear O2 sensors removed from the computer, will this prevent my problem?

    Thanks.

  4. #4
    Senior Member mrr23's Avatar
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    if you have the codes disabled, they will not come on and not report.

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    So the headers will not cause any codes to pop up from the front O2 sensors then?

    Thanks.

  6. #6
    Senior Member mrr23's Avatar
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    Quote Originally Posted by rchops33 View Post
    So the headers will not cause any codes to pop up from the front O2 sensors then?

    Thanks.
    a few times, some have had the o2 heater. it's rare.

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    Do headers cause any EGR codes to display?

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    Senior Member mrr23's Avatar
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    if you remove your EGR, yes. you will have to have the codes turned off as well.

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    If headers do not cause any EGR codes to pop up, then I will not remove the EGR. I'm just trying to find out if putting headers on cause any SES codes to pop up and if so, what codes they are and how to get rid of them.

    Thanks.

  10. #10
    Senior Member mrr23's Avatar
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    so long as the headers have all of the provisions to reinstall the EGR and AIR, no codes will come up.

  11. #11
    Senior Member 35thAnniZ28's Avatar
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    not having rear 02's cause me to run rich....

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    why did you remove them?

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    Quote Originally Posted by 35thAnniZ28 View Post
    not having rear 02's cause me to run rich....
    not really possible. The fronts control fueling, the rears just keep a check on the cats.

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    So this is what I plan on doing. I want to put pacesetter headers on the car with a y-pipe. I'm not going to put any cats on because the rear O2 sensors has been removed from my computer and no codes should pop up due to the cats missing. Then finish the exhaust from the y-pipe to mufflers and tips etc. Will this set up cause any SES codes to pop up?

    Thanks.

  15. #15
    Senior Member mrr23's Avatar
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    Quote Originally Posted by rchops33 View Post
    So this is what I plan on doing. I want to put pacesetter headers on the car with a y-pipe. I'm not going to put any cats on because the rear O2 sensors has been removed from my computer and no codes should pop up due to the cats missing. Then finish the exhaust from the y-pipe to mufflers and tips etc. Will this set up cause any SES codes to pop up?

    Thanks.

    are you keeping AIR and EGR?

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    Yes.

  17. #17
    Senior Member mrr23's Avatar
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    then, no. you should not get any codes.

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    thank you for your help

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