# 2.5rs help...

**URL:** <https://forums.speedlife.net/t/2-5rs-help/23721>\
**Category:** NYSpeed Automotive\
**Created:** [January 28, 2007, 2:53pm UTC](https://forums.speedlife.net/t/2-5rs-help/23721 "2007-01-28T14:53:20Z")\
**Posts on this page:** 1\
**Showing post:** 22

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**Author:** ![Fry](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/fry/32/7284_2.png) [@Fry](https://forums.speedlife.net/u/Fry)\
**Post date:** [January 30, 2007, 7:43am UTC](https://forums.speedlife.net/t/2-5rs-help/23721/22 "2007-01-30T07:43:54Z")

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Would an O2 sensor even cause this problem? I thought that unless you had a wideband O2 sensor (which most cars don’t?) they just send an on or off signal to the ECU telling it whether to run in enrich/warmup mode or not.

Am I partially or totally wrong?

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