# What color is the O2 sensor wire that goes to the computer?

**URL:** <https://community.cartalk.com/t/what-color-is-the-o2-sensor-wire-that-goes-to-the-computer/81367>\
**Category:** Maintenance/Repairs\
**Tags:** cherokee\
**Created:** [September 16, 2013, 5:16am UTC](https://community.cartalk.com/t/what-color-is-the-o2-sensor-wire-that-goes-to-the-computer/81367 "2013-09-16T05:16:38Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![PikesPeakJeeps](https://avatars.discourse-cdn.com/v4/letter/p/a88e57/32.png) [@PikesPeakJeeps](https://community.cartalk.com/u/PikesPeakJeeps)\
**Post date:** [September 16, 2013, 5:16am UTC](https://community.cartalk.com/t/what-color-is-the-o2-sensor-wire-that-goes-to-the-computer/81367/1 "2013-09-16T05:16:38Z")

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In my 1999 Jeep Cherokee, with a 4.0L inline 6, I need to find the color of the wiring harness wire from the pre-catalytic convertor oxygen sensor. Does anyone know? I think it’s the black with dark green strip, but I have found conflicting information on the internet and in my Haynes book.

Thanks!

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [September 16, 2013, 6:35am UTC](https://community.cartalk.com/t/what-color-is-the-o2-sensor-wire-that-goes-to-the-computer/81367/2 "2013-09-16T06:35:59Z")

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My sources show that the light green/red wire is the signal out wire from the O2 sensor.

Tester

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**Author:** ![PikesPeakJeeps](https://avatars.discourse-cdn.com/v4/letter/p/a88e57/32.png) [@PikesPeakJeeps](https://community.cartalk.com/u/PikesPeakJeeps)\
**Post date:** [September 17, 2013, 7:31am UTC](https://community.cartalk.com/t/what-color-is-the-o2-sensor-wire-that-goes-to-the-computer/81367/3 "2013-09-17T07:31:59Z")

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Thanks Tester. Can I ask what your sources are? I have never seen that color combo as the signal.  
This is the pre-cat sensor.

Steve

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [September 18, 2013, 2:17am UTC](https://community.cartalk.com/t/what-color-is-the-o2-sensor-wire-that-goes-to-the-computer/81367/4 "2013-09-18T02:17:31Z")

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My Bad!

Black/Dark Green wire is signal out to the computer.

Tester

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**Author:** ![PikesPeakJeeps](https://avatars.discourse-cdn.com/v4/letter/p/a88e57/32.png) [@PikesPeakJeeps](https://community.cartalk.com/u/PikesPeakJeeps)\
**Post date:** [September 21, 2013, 5:06am UTC](https://community.cartalk.com/t/what-color-is-the-o2-sensor-wire-that-goes-to-the-computer/81367/5 "2013-09-21T05:06:30Z")

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Thanks!