# o2 sensor(s)

**URL:** https://forums.speedlife.net/t/o2-sensor-s/125012
**Category:** SON240sx Automotive
**Created:** [June 2, 2009, 10:48am UTC](https://forums.speedlife.net/t/o2-sensor-s/125012 "2009-06-02T10:48:12Z")
**Posts on this page:** 6
**Page:** 1

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### Author: ![gtprince](https://avatars.discourse-cdn.com/v4/letter/g/bcef8e/32.png) [@gtprince](https://forums.speedlife.net/u/gtprince)
#### Post date: [June 2, 2009, 10:48am UTC](https://forums.speedlife.net/t/o2-sensor-s/125012/1 "2009-06-02T10:48:12Z")

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how many o2 sensors do s14 240sx’s have, i called the guy at nissan he said one, i read on the internet it has 2.

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### Author: ![87s15lt1](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/87s15lt1/32/5706_2.png) [@87s15lt1](https://forums.speedlife.net/u/87s15lt1)
#### Post date: [June 2, 2009, 1:01pm UTC](https://forums.speedlife.net/t/o2-sensor-s/125012/2 "2009-06-02T13:01:47Z")

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what year? OBD 1 and 2 were available on S14’s.

Different emissions reulations

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### Author: ![XSNRGE](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/xsnrge/32/5565_2.png) [@XSNRGE](https://forums.speedlife.net/u/XSNRGE)
#### Post date: [June 2, 2009, 1:29pm UTC](https://forums.speedlife.net/t/o2-sensor-s/125012/3 "2009-06-02T13:29:49Z")

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Early 95’s have 1 while some late 95’s have 2 O2 sensors, 96’s an onwards had to have 2.

Just look at the downpipe and after the car. For sure there’s going to be one on your downpipe, that’s your pre-cat, then, if you’ve got an OBD2 setup, there should be another one after the cat, called the downstream O2 sensor

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### Author: ![gtprince](https://avatars.discourse-cdn.com/v4/letter/g/bcef8e/32.png) [@gtprince](https://forums.speedlife.net/u/gtprince)
#### Post date: [June 2, 2009, 8:33pm UTC](https://forums.speedlife.net/t/o2-sensor-s/125012/4 "2009-06-02T20:33:45Z")

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well my old exhaust only had one connected to the downpipe and now this new one has 2. so i’m tinking to just cover it with a peice of metal or put a bolt in.

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### Author: ![Dj-Infinit](https://avatars.discourse-cdn.com/v4/letter/d/7cd45c/32.png) [@Dj-Infinit](https://forums.speedlife.net/u/Dj-Infinit)
#### Post date: [June 3, 2009, 8:36am UTC](https://forums.speedlife.net/t/o2-sensor-s/125012/5 "2009-06-03T08:36:24Z")

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there is two, one on the manifold one on the downpipe, urs is missing downpipe one…

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### Author: ![Lucidsnow](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/lucidsnow/32/5538_2.png) [@Lucidsnow](https://forums.speedlife.net/u/Lucidsnow)
#### Post date: [June 4, 2009, 10:50am UTC](https://forums.speedlife.net/t/o2-sensor-s/125012/6 "2009-06-04T10:50:44Z")

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wat dj infiniti said. but only one on manifold matters.