# The FRC Project

**URL:** <https://forums.speedlife.net/t/the-frc-project/238038>\
**Category:** Builds\
**Created:** [July 29, 2008, 8:58am UTC](https://forums.speedlife.net/t/the-frc-project/238038 "2008-07-29T08:58:19Z")\
**Posts on this page:** 1\
**Showing post:** 59

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**Author:** ![99FRC](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/99frc/32/6335_2.png) [@99FRC](https://forums.speedlife.net/u/99FRC)\
**Post date:** [May 9, 2010, 7:49am UTC](https://forums.speedlife.net/t/the-frc-project/238038/59 "2010-05-09T07:49:41Z")

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> [@Water Main Breaks](https://forums.speedlife.net/t/water-main-breaks/31763/6):
>
> That blows my mind…without o2 simulators? I dont know how you dont have a CEL, even though you used all 4 o2 sensors (which most of the header/x kits do), your cats are still gone!! The up-stream o2 sensors are for engine management and the downstream o2 sensors basically just check to see if your cat is working IIRC. If there is no cat, WTF!? Its obviously not working LOL.

Maybe it is just going to take more time/miles before I get the CEL then? I don’t know. I do know it is running richer as I can smell the unused gas now and it blows very little smoke at WOT. Still no CEL though. I will update you when/if it comes up.

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