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MOT Faild today??????????

andya3turbo Sep 13, 2012

  1. andya3turbo

    andya3turbo Member

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    A3 faild its mot today on emissions CO levels too high, getting 0.57 on fast idle and limit is 0.30
    and getting 0.56 on idle. any ideas what this could be? my air filter is a bit dark black but have seen worse??. oil was changed and filter 3 months ago? also tester said about spark plugs not gapped? anyone have any ideas?

    thanks
     
  2. Greg-S3

    Greg-S3 Active Member

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    Have the car scanned for faults, get the car really hot before your next re-test, have the MAF sensor checked when scanned, when scanned see what the lamda's are reading, those fuel tank additives work, the good ones anyway!
     
  3. aragorn

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    What was lambda value?

    If it was sitting at lambda 1 with sensible HC then your cats either dead or missing.
     
  4. Danio

    Danio AUDI-MANIACS.COM

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    How come I've never seen you in Skem???Come to me andwe can check it what is wrong with your car. I'm in old Skem.
     
  5. Benjiman46

    Benjiman46 R-Tech Terrorist

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    Dead cat(s) I'm afraid
     
  6. gazzas3

    gazzas3 Member

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    could also just be something simple like it needing a full service, with new plugs or the car wasn't up to temp while checking the emissions.
     
  7. s33nyboy12

    s33nyboy12 Well-Known Member

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    Paste it first with a forte engine cleaner and shell optimax in the fuel tank , worked for my focus st! :)
     
  8. Scoot123

    Scoot123 New Member

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    I am a tester,give your car a good hard drive before u get it retested again.
     
  9. Danio

    Danio AUDI-MANIACS.COM

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    Put a brake fluid to the throttle body. It will clean all system but it will smoke for a couple of minutes.
     
  10. actualeddie

    actualeddie Member

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    Maybe Terraclean, always wanted to try it myself
     
  11. andya3turbo

    andya3turbo Member

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    Cheers everyone for tips and advice, i used cata clean and nothing still sky high CO 's as above the cat is dead, lambada is fine tho atleast, got the old cat off yesterday. a little something i thought i would mention tho, i seen a video on YouTube about cat testing and it said that a small hole or gaps in the manifold joint can lead to high levels, on removing the cat one of the bolts was missing and the other was loose:wtf: i am just thinking is it all that simple??? there's no rattle on the cat or anything so nothing is crumbled inside unless its burnt up? my new cat is ordered now so sit back and wait:icon_thumright:
     
  12. Greg-S3

    Greg-S3 Active Member

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    It could be as simple as replacing the stud and tighten it up! I remember fixing a vauxhall Astra that was running massively rich, turned out the problem was a tiny crack in the manifold after bank 1 lamda and before bank 2 and it turned out cold air (taken in from the crack)
    was rushing past bank 2 lamda which was raising the fuel put into the system hence high c0!!
     

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