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Duff cat(s) or duff lamda probe(s) ?

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by bikefright, Jul 16, 2007.

  1. bikefright
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    bikefright Member

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    [Jul 16, 2007]
    I've posted many times about my coilpack troubles - now it seems I keep getting the engine management light on with "warm up catalyst below threshold", "Misfire detected cylinder 1(or 3)" and "random/multiple missfire detected".

    I'm hoping someone far more techie than I could confirm that bad cat(s) or bad pre/post lamda probes could cause this......

    When under hard acceleration, the engine management light sometimes flashes and eventually, if I don't back off the throttle, it will stay on. When I hook up the VAG-COM, I get the same three codes (posted in May to the vag-com forum).

    Car has just had an MOT and passed the emmisions tests.....

    I have around 85K on the clock.

    Any ideas?
    #1
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  3. terrysingh
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    terrysingh Member

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    [Jul 16, 2007]
    hey dude

    i have a mate who works for gsf or one of these whole sale car parts companys and give me staff discount when i need it, if you get stuck with cost give me a shout? but regarding you warning on your dash, have you changed your coils yet????
    #2
  4. bikefright
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    bikefright Member

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    [Jul 16, 2007]
    Cheers man,

    Cheaper parts would be great once I've figured out what's broken :D
    I gather that the over the counter price for a cat is around 700 squids!! Aaaargh!

    I had 4 coilpacks go earlier this year - I replaced all 6 as a precaution.
    #3
  5. terrysingh
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    terrysingh Member

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    [Jul 16, 2007]
    i got a replacement startermotor for my a2 for £45 new, not a recon, i think the cats are half what audi charge?
    #4
  6. Nickynibbles
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    Nickynibbles Damn it where's 7th gear when you need it?!

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    [Jul 17, 2007]
    I had a solid engine managment light come up on my 3.0 Quattro Sport a few months ago, didnt have any performance dips though. Audi diagnosed failure of the 2 main cats & recomended replacing them, luckily I had a Network Q warranty & after a day of them saying to themselves "why are Audi so expensive for parts?!" they agreed to pay the bill, £715+VAT for parts & labour, ouch!!! If you've got performance issues then does seem like something else is up, try changing the coil pack from cylinders 1 & 3 with another cylinder & if the misfire warning moves with it then you've got another coilpack failure, get it replaced as faulty by Audi in which case.
    #5
  7. bikefright
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    bikefright Member

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    [Jul 17, 2007]
    Cheers Nickynibbles,

    I don't have a performance issue - car runs like a dream. I might try the coil pack swap - I know what a failed coilpack feels like :-(

    Car doesn't smell of eggs either this is why I think it might be O2 sensor(s)
    ATB,
    R.
    #6
  8. Elberoth
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    Elberoth Member

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    [Jul 17, 2007]
    Swap both coilpacks and spark plugs.
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