# Need o2 sensor help (down-stream)

**URL:** <https://forums.speedlife.net/t/need-o2-sensor-help-down-stream/252314>\
**Category:** Shift518 Automotive\
**Created:** [May 27, 2010, 9:15am UTC](https://forums.speedlife.net/t/need-o2-sensor-help-down-stream/252314 "2010-05-27T09:15:30Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![ninety1two40](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ninety1two40/32/6332_2.png) [@ninety1two40](https://forums.speedlife.net/u/ninety1two40)\
**Post date:** [May 27, 2010, 11:34am UTC](https://forums.speedlife.net/t/need-o2-sensor-help-down-stream/252314/4 "2010-05-27T11:34:38Z")

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> [@J&J vs. Firehawk853](https://forums.speedlife.net/t/j-j-vs-firehawk853/32197/88):
>
> again, Im not 100% im testing it right (what wire is positive vs. negative… do I put pos. on the battery and neg on the sim… or is it **pos. on the sim. and neg. on the battery/chassis** ). SO i cant promise those readings are correct or not.

That should work…

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