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CANT PASS EMISSIONS HIGH NOX LEVEL

Tiny
STREETKINGZ
  • MEMBER
  • 1992 LEXUS ES 300
I was wondering if anyone can help I cant pass emission I went to them 3 times the first time I went it say I had high CO but I change the o2 sensor both and I went again a 2nd time it still fail not the CO but the NOX level
I went and got a new EGR Valve from a used auto parts place went home and clean it and took it out there the 3rd time still didn't pass still had high NOX level like last time but a little lower

I don't know what the problem is the last thing I was gonna do is to change the catylistic converter to a new one but I dont want to change it and have the same result
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Thursday, April 18th, 2013 AT 9:24 PM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
It would be nice if we had the exact readings

Roy
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Friday, April 19th, 2013 AT 2:28 AM
Tiny
STREETKINGZ
  • MEMBER
  • 22 POSTS
Sorry was In a rush but the reading for the Nox was
The limit was 1.500 my reading was 1.892
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Friday, April 19th, 2013 AT 3:40 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would use only a new egr valve.

The cat converter sounds like the failure

Roy
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Friday, April 19th, 2013 AT 3:56 PM
Tiny
STREETKINGZ
  • MEMBER
  • 22 POSTS
Ok thanks ill try that and let u know the result
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Friday, May 3rd, 2013 AT 7:19 AM
Tiny
STREETKINGZ
  • MEMBER
  • 22 POSTS
What type of cat do u recommeded a catco or a magnaflow
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Friday, May 3rd, 2013 AT 7:23 AM

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