# 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:** 12

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**Author:** ![system](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/2X/b/b7170c8eddc0b95ece6b88172b2f416a08489a45.png) [@system](https://forums.speedlife.net/u/system)\
**Post date:** [August 29, 2007, 4:12pm UTC](https://forums.speedlife.net/t/91-nx2000-emission-help/134285/12 "2007-08-29T16:12:16Z")

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> [@DSL vs POWERLINK](https://forums.speedlife.net/t/dsl-vs-powerlink/2156/23):
>
> 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.

I know I am running rich as I have backfire at 4,500rmp+ when i left off throttle, even when under no load. I just got a bottle of new seafoam and going to put it in the tank (half of it anyways). New NGK O2 sensor can be had for $84 so I might get that, but today i rechecked and my egr and it doesn’t open at all under free revs, so it might be BPT or even EGR solenoid…

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