Nitric Oxide (NO) is really high, how can I lower it?

Reply Subscribe

Thread Tools

Search this Thread

Dec 2, 2009 | 06:46 PM

timwu12

Thread Starter

Member

Joined: Jul 2007

Posts: 86

Likes: 0

Nitric Oxide (NO) is really high, how can I lower it?

Just went through a smog check, nitric oxide levels are almost near maximum...how can I bring those down?

Dec 2, 2009 | 08:32 PM

tech

Administrator

Joined: Sep 2004

Posts: 36,349

Likes: 45

From: Orlando, Florida

A little info on the car please.
Last tune up?
How old are the O2 sensors?

Dec 3, 2009 | 02:59 AM

timwu12

Thread Starter

Member

Joined: Jul 2007

Posts: 86

Likes: 0

sorry, it's a 96 with 166k miles, last tune up was at 150K miles

i just bought the car last week, so no idea how old O2 sensors are. from the looks of the records, seems like it might be original

Dec 3, 2009 | 08:41 AM

fcpgroton

Former Sponsor

Joined: Jul 2008

Posts: 1,710

Likes: 0

I would change out the O2 sensors then. 166K on the original O2 sensor is a long time.

Also, how is your gas mileage?

Dec 3, 2009 | 12:30 PM

timwu12

Thread Starter

Member

Joined: Jul 2007

Posts: 86

Likes: 0

gas mileage was around 22 for combined city and highway. don't know what highway alone is like

Dec 3, 2009 | 06:26 PM

Carrots

Senior Member

Joined: Aug 2007

Posts: 684

Likes: 2

From: Columbus, OH

Does your car have EGR? If it does, clean the EGR valve and ports in the intake... The main purpose of the EGR system is lowering NOx emissions. If it doesn't have an EGR system... the cat could be getting weak. But yeah, DEFINITELY change the O2 sensors... they're supposed to be changed about every 100,000 miles.