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Is my cat knackered?

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by hellierlee, Feb 23, 2012.

  1. hellierlee
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    hellierlee New Member

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    [Feb 23, 2012]
    Got a 2004 Audi a4 1.8t s line. Ok story goes I have had a tapping noise coming for a while now and yesterday I just lost all power, and it stalls when idle. I can rev it and it stays running but it won't drive, just creeps along. My friend has said it could be your cat knackered so just seeing your thoughts? Many thanks
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  3. StuG808
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    StuG808 1.9tdi130 Avant FailWheelDrive

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    [Feb 23, 2012]
    I don't know Audi's that well, but I know cars, and that really doesn't sound like a knackered cat. Your friend might be mistaking it for the lamda sensor which is usually on the cat, or downpipe, but it wouldnt affect it that badly.
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  4. hades-
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    hades- Yorkshire & Humber Rep. Regional Rep VCDS Map User

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    [Feb 23, 2012]
    have you got any warning lights up ?
    id get it on vcds or a scanner b4 you change the cat
    could be anything
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  5. hellierlee
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    hellierlee New Member

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    [Feb 23, 2012]
    He actually said it could be a blocked cat. So he reckons I should take the cat of and see if the car runs then without stalling. Then obviously if it runs then the fault points to my cat
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  6. StuG808
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    StuG808 1.9tdi130 Avant FailWheelDrive

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    [Feb 23, 2012]
    Well, as noted it could be anything. Probably easier getting a garage to run a diagnostic on it that taking the cat on-and-off.
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  7. hellierlee
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    hellierlee New Member

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    [Feb 23, 2012]
    True but can't get it to a garage lol
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  8. hades-
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    hades- Yorkshire & Humber Rep. Regional Rep VCDS Map User

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    [Feb 23, 2012]
    if your mate is so sure its the cat get him to prove it by removeing
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  9. Paul100
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    Paul100 Member

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    [Feb 23, 2012]
    hang on i have a photo of a knackered cat somewhere, it may help. I will dig it out....
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  10. hades-
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    hades- Yorkshire & Humber Rep. Regional Rep VCDS Map User

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  11. BlackQuat
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    BlackQuat Well-Known Member VCDS Map User

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    [Feb 23, 2012]
    It is entirely possible. How hot is it getting if it does run? Does it smell of rotten eggs?

    Get it off, smash the internals of the cat out with a pole and run it. Extra bhp and easy fix.
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  12. Paul100
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    Paul100 Member

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    [Feb 23, 2012]
    ]here it is...................





    [​IMG]
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  13. Paul100
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    Paul100 Member

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    [Feb 23, 2012]

    hate it when someone else finishes off your joke.............................
    Last edited: Feb 23, 2012
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  14. Paul100
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    Paul100 Member

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    [Feb 23, 2012]
    Wont that fail an emmissions test at MOT time?
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  15. hades-
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    hades- Yorkshire & Humber Rep. Regional Rep VCDS Map User

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    [Feb 23, 2012]
    if it is the cat and you smash it out
    it will sound ****e
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  16. BlackQuat
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    BlackQuat Well-Known Member VCDS Map User

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    [Feb 23, 2012]
    Probably not tbh
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  17. hades-
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    hades- Yorkshire & Humber Rep. Regional Rep VCDS Map User

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    [Feb 23, 2012]
    its a petrol so removeing or smashing the internals out of the cat will fail the mot
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  18. BlackQuat
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    BlackQuat Well-Known Member VCDS Map User

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    [Feb 23, 2012]
    I've had a car pass an mot without a cat.
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  19. hades-
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    hades- Yorkshire & Humber Rep. Regional Rep VCDS Map User

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    [Feb 23, 2012]
    pre a certain yeah they do pass but the a3 wont
    what car was it ?
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  20. BlackQuat
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    BlackQuat Well-Known Member VCDS Map User

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    [Feb 23, 2012]
    A 97 Vectra V6
    #19
  21. docurley
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    docurley Moderator Staff Member Moderator

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    [Feb 24, 2012]
    Dose the CAT glow red if you keep the car running for a while also look in the VAGCOM/VLC section and post up there to see if someone is local to you and would not might scanning the car. Another option is by one of thouse had scanners of ebay there basic but will let you know if you have any code and comes with a book to tell you what the problem is.
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  22. StuG808
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    StuG808 1.9tdi130 Avant FailWheelDrive

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    [Feb 24, 2012]
    I would really advise getting it properly diagnosed, there must be mobile vagcom people around? It 'might' be the cat, but only as much as it might be anything else: fuelling problem/diagnostic shutdown mode/internal failure etc. And removing a cat can be a pain in the backside: a whole afternoon of rolling around under the car hoping that the studs wont snap and having to replace the gaskets, and chances are it may not fix it.
    #21

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