# Warning Light

**URL:** <https://forum.g2ic.com/t/warning-light/34214>\
**Category:** Hybrids & Advanced Aftermarket Engine Performance\
**Created:** [February 13, 2003, 7:43am UTC](https://forum.g2ic.com/t/warning-light/34214 "2003-02-13T07:43:58Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![system](https://forum.g2ic.com/user_avatar/forum.g2ic.com/system/32/1_2.png) [@system](https://forum.g2ic.com/u/system)\
**Post date:** [February 13, 2003, 7:43am UTC](https://forum.g2ic.com/t/warning-light/34214/1 "2003-02-13T07:43:58Z")

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Today when I was in the freeway the Check Engine Warning Light came upp. When I pull over and stop the car and turn off the engine. Then I turn back on the car the light is off? Can some1 help me on this?? What could be the problem if i do got one???

Thx

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**Author:** ![system](https://forum.g2ic.com/user_avatar/forum.g2ic.com/system/32/1_2.png) [@system](https://forum.g2ic.com/u/system)\
**Post date:** [February 13, 2003, 7:55am UTC](https://forum.g2ic.com/t/warning-light/34214/2 "2003-02-13T07:55:12Z")

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Have you messed with the O2 censor at all…like changing out your manifold to a header?

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**Author:** ![system](https://forum.g2ic.com/user_avatar/forum.g2ic.com/system/32/1_2.png) [@system](https://forum.g2ic.com/u/system)\
**Post date:** [February 14, 2003, 7:52am UTC](https://forum.g2ic.com/t/warning-light/34214/3 "2003-02-14T07:52:36Z")

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No i didnt do notthing. Today it happened agian i dont know what wrong with it. :shrug:

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**Author:** ![system](https://forum.g2ic.com/user_avatar/forum.g2ic.com/system/32/1_2.png) [@system](https://forum.g2ic.com/u/system)\
**Post date:** [February 14, 2003, 8:28am UTC](https://forum.g2ic.com/t/warning-light/34214/4 "2003-02-14T08:28:11Z")

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Well then bro… you got me. My check light has just come on when driving but it was because air was coming in from behind my header that I installed… simple fix but for the most part I would think it is the o2 that is doing it for you… good luck!!

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**Author:** ![system](https://forum.g2ic.com/user_avatar/forum.g2ic.com/system/32/1_2.png) [@system](https://forum.g2ic.com/u/system)\
**Post date:** [February 14, 2003, 6:06pm UTC](https://forum.g2ic.com/t/warning-light/34214/5 "2003-02-14T18:06:10Z")

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next tiem it happens, check what code the ECU is giving. that will point you in what direction to go.

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**Author:** ![system](https://forum.g2ic.com/user_avatar/forum.g2ic.com/system/32/1_2.png) [@system](https://forum.g2ic.com/u/system)\
**Post date:** [February 16, 2003, 5:38am UTC](https://forum.g2ic.com/t/warning-light/34214/6 "2003-02-16T05:38:30Z")

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How can I check the code from the ECU??? What do I need to do??

Thx