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  • Intermittent CEL?

    Vehicle: 2000 Volkwagen Jetta VR6

    Just looking for some input regarding my issue:

    Long story short, involved in a minor fender bender at a very slow speed. Some guy hit my rear bumper and cracked or chipped some paint. Since the incident, my CEL has been on. Drove around, nothing noticeable other than the CEL. Scanned the code: P0420 - Cat. Eff. blah blah. Cleared the code, changed the plugs (noticed a decrease in fuel mileage), CEL stayed off. Did some more driving, CEL came back on. I did not, however, scan the car again because I just assumed it was the same code (also, when I say scan, I don't have a VAG-COM, just a generic reader). One night though, I start my car and notice the CEL doesn't go on. And now I'm still driving it with no difference in performance or anything, as well as no CEL. Going through insurance to get the estimate done at a body shop.

    My question:
    Still something worth looking into by the body shop? How can I prove that the CEL was there, but isn't now? Being as the body shop doesn't do any mechanical work, I spoke with them and was told that they sublet any mechanical work to be done by another shop (generic garage). I was actually hoping to get TuneDub to do the diagnosis and repair.
    What's my best course of action here...?

    Any input would be greatly appreciated!

    Thanks!
    Last edited by jeLo; 12-03-2012, 06:06 PM.

  • #2
    Re: Intermittent CEL?

    I have run into a similar problem before. Mk4 was hit in the rear nothing to bad but ending up hitting the exhaust. Put a small hole into the pipe due to a bend and connection to o2 sensor broke
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    • #3
      Re: Intermittent CEL?

      Just because you have no visible CEL...cpu will store it as a"soft code" Vag-Com will pull it up through a proper scan.
      Hers 2009 Audi A4 6sp manual
      Mine....2005 Golf TDI, VNT 17, Malone tuned stage 4, Spec stage 2 clutch, FMIC, Ventectomy, NewSouth gauges, BuzzKen 2.5 turbo back exhaust, Evolution Skidplate, Helix OEM Reps retrofitted with Morimoto Bixenon mini's, ST coils, colour matched Huffs. Frostheater

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      • #4
        Re: Intermittent CEL?

        but will the body shop even entertain the idea if the CEL isn't visible to them?

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        • #5
          Re: Intermittent CEL?

          Once you tell them its gone to soft code, they should look into it...or find someone here to do it...most guys will for a case of beer! haha
          Last edited by Geobmx4life; 12-03-2012, 08:21 PM.
          Hers 2009 Audi A4 6sp manual
          Mine....2005 Golf TDI, VNT 17, Malone tuned stage 4, Spec stage 2 clutch, FMIC, Ventectomy, NewSouth gauges, BuzzKen 2.5 turbo back exhaust, Evolution Skidplate, Helix OEM Reps retrofitted with Morimoto Bixenon mini's, ST coils, colour matched Huffs. Frostheater

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          • #6
            Re: Intermittent CEL?

            I'm sure someone here would but I'm trying to get the other guy's insurance company to foot the bill, my car was fine before then.

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            • #7
              Re: Intermittent CEL?

              Then my advice would be to go see George at Tunedub, he may be able to read the codes for you...worth the $$$ if it save in the long run.
              Hers 2009 Audi A4 6sp manual
              Mine....2005 Golf TDI, VNT 17, Malone tuned stage 4, Spec stage 2 clutch, FMIC, Ventectomy, NewSouth gauges, BuzzKen 2.5 turbo back exhaust, Evolution Skidplate, Helix OEM Reps retrofitted with Morimoto Bixenon mini's, ST coils, colour matched Huffs. Frostheater

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              • #8
                Re: Intermittent CEL?

                Intermittent CEL? On a mk4? Noooooooooo not possible
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