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Faild Smog. High "NO" Nitrogen Oxide levels are high

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    Faild Smog. High "NO" Nitrogen Oxide levels are high

    So my 325i E30 failed the smog test today. On the print out it says my Nitrogen Oxide "NO" levels are high. Everything else was good. Does anyone know what might cause that and how I can fix it?


    My stuff for sale
    http://www.r3vlimited.com/board/showthread.php?t=229541

    #2
    your engine may be running lean or you're catalytic converter has aged beyond it's usefulness.
    --Will

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      #3
      Vac leaks, Vac leaks, Vac leaks...

      Have a shop run a smoke test, you are too lean.

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        #4
        +1

        Either the engine is running lean or the catalytic converter is bad. A smoke test should be the first step. Then check rail fuel pressure.
        The car makes it possible, but the driver makes it happen.
        Jim Levie, Huntsville, AL

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          #5
          The catalytic converter is less than year old, so i doubt that's it. But I will definitely looking into those vacuum leaks. Thanks for the quick responses.


          My stuff for sale
          http://www.r3vlimited.com/board/showthread.php?t=229541

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