P0240 Comes off and on - FirebirdV6.com/CamaroV6.com Message Board

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  • P0240 Comes off and on

    Hey guys, I'm getting the code p0420 that I've had checked from autozone a couple of times. I've had a cat replaced within the last year; It says that the code could be from either my cat or o2 sensors, but why does it come off for a week then come back on for a couple of days, then go back off? odd.. since it's nothing serious should I just get my emissions tested while it's off :rolleyes:
    Last edited by jkelley; 07-20-2008, 12:53 PM.

  • #2
    Re: P0240 Comes off and on

    Originally posted by brianc869
    Do you mean P0420, catalyst inefficiency? Just curious.
    yes exactly what i mean.. sorry for that typo

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    • #3
      Re: P0240 Comes off and on

      anyone know?

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      • #4
        Re: P0240 Comes off and on

        Same code mine popped while I was still running the stock exhaust. New Cat and Magnaflow on, erased the code and it popped again, so I'm guessing mine is an O2 sensor, just don't know which one (hope someone here does). Mine just stays on all the time though, so wouldn't know about that.
        <a href=\"http://www.cardomain.com/ride/2182744\" target=\"_blank\">http://www.cardomain.com/ride/2182744</a> <br /><br /> </font><blockquote><font size=\"1\" face=\"Verdana, Helvetica, sans-serif\">quote:</font><hr /><font size=\"2\" face=\"Verdana, Helvetica, sans-serif\">I\'ll procrastinate later...</font><hr /></blockquote><font size=\"2\" face=\"Verdana, Helvetica, sans-serif\">

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        • #5
          Re: P0240 Comes off and on

          Wrong section, moving.
          *Matt


          Old people shouldnt use the internet.

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