# 91 NX2000 Emission Help

**URL:** <https://forums.speedlife.net/t/91-nx2000-emission-help/134285>\
**Category:** Canada Nissan Automotive\
**Created:** [August 28, 2007, 12:35pm UTC](https://forums.speedlife.net/t/91-nx2000-emission-help/134285 "2007-08-28T12:35:39Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![pcproa](https://avatars.discourse-cdn.com/v4/letter/p/c5a1d2/32.png) [@pcproa](https://forums.speedlife.net/u/pcproa)\
**Post date:** [August 29, 2007, 12:35pm UTC](https://forums.speedlife.net/t/91-nx2000-emission-help/134285/11 "2007-08-29T12:35:24Z")

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> [@9/11/05 BAO meet....8ish](https://forums.speedlife.net/t/9-11-05-bao-meet-8ish/2104/82):
>
> I understand what you are saying, I pretty much did everything (except for new O2) the legal way. I seafoamed the engine 3 times, although I did not run it through gas to clean injectors. I think I will try to get a new O2 sensor, as it will help with future fuel economy.  
> The other location is Carquest, the one in Oakville on Speers Rd. always carries Seafoam, I really like that product.

Yes yes CARQUEST. That’s it.  
The O2 sensor doesn’t only help with fuel economy. It helps with emissions for sure.  
My left O2 sensor was bad (It was always showing rich) and not triggering a fault code with the ECU so my ECU was trying to compensate and as a result the left bank of cylinders was running lean.

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