# Z O2 Sensor Opinion **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [September 21, 2011, 5:01pm UTC](https://forums.speedlife.net/t/z-o2-sensor-opinion/216764 "2011-09-21T17:01:19Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![1QIKZ](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/1qikz/32/6112_2.png) [@1QIKZ](https://forums.speedlife.net/u/1QIKZ)\ **Post date:** [September 21, 2011, 5:01pm UTC](https://forums.speedlife.net/t/z-o2-sensor-opinion/216764/1 "2011-09-21T17:01:19Z")
My fluctuating idle and stumbling issue came up again last Friday (Josh already knows about this) and the ECU brought up a new code…Oxygen Sensors. Fortunately I had them already as I thought these could be the issue when this problem came up a few weeks ago. In short, cleaning the MAF sensors cleared up the problem but apparently bad 02 sensors produce the same symptoms. Looking for a professional opinion on the ones removed. Since I’ve never had to replace them, in any vehicle, I don’t know if these show any symptoms of other problems or if they look “normal”. I did notice the passenger side was markedly darker than the driver’s side. I don’t feel good about that. I don’t know if either of them look “like they should” for a used 02. Your opinions would help. Thanks for the time. [ATTACH=CONFIG]19068[/ATTACH] ---
**Author:** ![1QIKZ](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/1qikz/32/6112_2.png) [@1QIKZ](https://forums.speedlife.net/u/1QIKZ)\ **Post date:** [September 21, 2011, 5:49pm UTC](https://forums.speedlife.net/t/z-o2-sensor-opinion/216764/2 "2011-09-21T17:49:16Z")
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**Author:** ![ubengineering](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ubengineering/32/5171_2.png) [@ubengineering](https://forums.speedlife.net/u/ubengineering)\ **Post date:** [September 22, 2011, 5:02am UTC](https://forums.speedlife.net/t/z-o2-sensor-opinion/216764/3 "2011-09-22T05:02:44Z")
why bother with those just buy new ---
**Author:** ![Onyx\_Z32](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/onyx_z32/32/7581_2.png) [@Onyx\_Z32](https://forums.speedlife.net/u/Onyx_Z32)\ **Post date:** [September 22, 2011, 6:44am UTC](https://forums.speedlife.net/t/z-o2-sensor-opinion/216764/4 "2011-09-22T06:44:01Z")
Did you even read what he wrote or did you just look at the pictures and guess? ---
**Author:** ![MaximaSE98](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/maximase98/32/7600_2.png) [@MaximaSE98](https://forums.speedlife.net/u/MaximaSE98)\ **Post date:** [September 22, 2011, 8:22am UTC](https://forums.speedlife.net/t/z-o2-sensor-opinion/216764/5 "2011-09-22T08:22:21Z")
i pulled the 02s from my maxima when i had it cause i was getting an 02 code…mine looked a little burnt with like an ashy color…not quite white…the darker one looks like that bank is running rich which could be the fault of a bad 02…again just my past experience with my nissans i could very well be wrong ---
**Author:** ![TradersBASE](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/tradersbase/32/5321_2.png) [@TradersBASE](https://forums.speedlife.net/u/TradersBASE)\ **Post date:** [September 22, 2011, 8:36am UTC](https://forums.speedlife.net/t/z-o2-sensor-opinion/216764/6 "2011-09-22T08:36:48Z")
Those don’t look new at all. I keed, I keed. GL, hope you get the lil bugs worked out and it was nice meeting you yesterday. ---
**Author:** ![ieatpaint](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ieatpaint/32/7311_2.png) [@ieatpaint](https://forums.speedlife.net/u/ieatpaint)\ **Post date:** [September 22, 2011, 9:19am UTC](https://forums.speedlife.net/t/z-o2-sensor-opinion/216764/7 "2011-09-22T09:19:39Z")
They look like any of the bad sensors that I’ve pulled. I’ve never pulled one before it went bad so I can’t say if they are cleaner when they’re functioning properly. ---
**Author:** ![1QIKZ](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/1qikz/32/6112_2.png) [@1QIKZ](https://forums.speedlife.net/u/1QIKZ)\ **Post date:** [September 22, 2011, 12:59pm UTC](https://forums.speedlife.net/t/z-o2-sensor-opinion/216764/8 "2011-09-22T12:59:22Z")
Going to put a few more miles on it tonight and see if she’s still running back to “normal”. Don’t think I want to pull them back out anytime soon to see how they’re doing. Thanks for the input.