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  1. #1
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    Decat pipe bring on management light?

    I have just ordered a decat pipe for my 1.8t and was wondering if fitting it will bring the the managment light on because of the pre and post cat lambda sensors reading the same.
    If so what can i do to sort it?

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  3. #2
    jamie226bhp's Avatar
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    have a look on ebay as they do a sleeve that the lamda screws into which goes into the post cat hole which keeps it enclosed from the exhaust gasses thus given the lamda a different reading to the pre cat one

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    "Stick a V8 in it!"

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    does your B5 even have two lambdas?

    AEB/AJL certainly doesnt, so unless the later DBW cars have it...

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    As long as you only have the pre cat lambda then no light will come on.

    I had a turbo back stainless exhaust on my AEB with no problems at all

    Its the later wideband cars that have the pre/post sensors iirc

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    macca's Avatar
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    on my AEB 98 a4 the decat pipe didn't matter as only one probe, my r32 with 4 probes, yes expensive, would through a check engine light if decatted. but these can be coded out i believe by remapping.
    1998 A4 1.8T Sport - For Saturdays
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    Mods- Forge Dump Valve, The Engine Shop Power Plus based Engine (Low Comp. Forged pistons, Arrow H-Section Rods, Newman fast road cams, polished & ported head), 19" wheels, B&M Short Shifter, Greddy Turbo Timer, RS4 Grill, Weitec GTN coilovers, HKS modified air filter, Autobahn88 FMIC, ChippedUK custom map. Some Turbo mods ongoing.

  7. #6
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    Badpanel,can you tell me where you purchased your decat from?I cannot find any listed on e-bay.If anybody on here as one for sale to fit an aeb a4 engine please pm me.

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    Mine does have two on it and is a AWT engine! pain in the arse was hoping to put it on and run it for a while before having a remap.

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    macca's Avatar
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    Look for THS decat, usually on ebay, has two lambda holes bu also comes with lower one plugged.

    i would change gaskets for new audi ones though as the ones that came with mine didn't last long.
    1998 A4 1.8T Sport - For Saturdays
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    Mods- Forge Dump Valve, The Engine Shop Power Plus based Engine (Low Comp. Forged pistons, Arrow H-Section Rods, Newman fast road cams, polished & ported head), 19" wheels, B&M Short Shifter, Greddy Turbo Timer, RS4 Grill, Weitec GTN coilovers, HKS modified air filter, Autobahn88 FMIC, ChippedUK custom map. Some Turbo mods ongoing.

  10. #9
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    Yeh mine is a ths one and i should get it next week. Dont seem to be any for sale on ebay at the moment.

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    Quote Originally Posted by jamie226bhp View Post
    have a look on ebay as they do a sleeve that the lamda screws into which goes into the post cat hole which keeps it enclosed from the exhaust gasses thus given the lamda a different reading to the pre cat one
    Do you have one? Any clues what to search for?

  12. #11
    jamie226bhp's Avatar
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    on ebay.com and search for vw audi test pipe fix or mod and this should find some

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    jcb
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    spark plug spacer or search vwvortex for Wayne angle block $30 IIRC

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    Quote Originally Posted by jamie226bhp View Post
    on ebay.com and search for vw audi test pipe fix or mod and this should find some
    Cheers for that mate! Ordered one from the states should be here soon.
    Do you have a twin lambda on your car? if so did this mod work ok for you?

    Cheers.

  15. #14
    jamie226bhp's Avatar
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    only single i think but i haven't fitted a decat yet but was just trying to work out what bits i might need in advance

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    I'll let you know how i get on when my adapter arrives!

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    Right then my adapter arrived from the u.s and have fitted it along with the decat pipe and so far no light on and has made a bit of difference to spool up and has made the exhaust note slightly louder witch is cool as my stainless system was too quite before.
    I'm pleased with it!
    Has anyone fitted a generic chip from anyone off ebay??

  18. #17
    jamie226bhp's Avatar
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    Quote Originally Posted by badpanel View Post
    Right then my adapter arrived from the u.s and have fitted it along with the decat pipe and so far no light on and has made a bit of difference to spool up and has made the exhaust note slightly louder witch is cool as my stainless system was too quite before.
    I'm pleased with it!
    Has anyone fitted a generic chip from anyone off ebay??
    anyone else make a decat as ths just seem to keep putting the price up 100 now

  19. #18
    Lee Goodall's Avatar
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    Why don't you just take the guts out of the CAT?.. costs you nothing and produces the same results!

    AWT engine code?.. must be one of the last B5 turbos?

  20. #19
    jamie226bhp's Avatar
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    Quote Originally Posted by Lee Goodall View Post
    Why don't you just take the guts out of the CAT?.. costs you nothing and produces the same results!

    AWT engine code?.. must be one of the last B5 turbos?

    don't really want to ruin a good cat but i'll see if i can find a worn one, aren't the ths one's a bigger diameter though

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    Quote Originally Posted by Lee Goodall View Post
    Why don't you just take the guts out of the CAT?.. costs you nothing and produces the same results!

    AWT engine code?.. must be one of the last B5 turbos?
    Yeh i beleive it is one of the latest b5's, any one know what turbo is fitted to an AWT engine code.
    And is a chip off ebay worth getting??

  22. #21
    Lee Goodall's Avatar
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    Quote Originally Posted by jamie226bhp View Post
    don't really want to ruin a good cat but i'll see if i can find a worn one, aren't the ths one's a bigger diameter though
    Unless you're increasing the diameter of the entire exhaust system to match then I can't see that you'll gain anything by just increasing the diameter of the CAT to be honest.

  23. #22
    Lee Goodall's Avatar
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    Quote Originally Posted by badpanel View Post
    Yeh i beleive it is one of the latest b5's, any one know what turbo is fitted to an AWT engine code.
    And is a chip off ebay worth getting??
    It's a K03-029 turbo mate.. same as APU. Bigger than the AEB and AJL K03-005 turbo.

    Not had any experience with the ebay chips but AFAIK people have used the generic ones with good results. I suppose it all depends on the supplier.. might be worth creating another thread to see who people suggest.
    Last edited by Lee Goodall; 26th January 2010 at 00:05.

  24. #23
    jamie226bhp's Avatar
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    Quote Originally Posted by Lee Goodall View Post
    Unless you're increasing the diameter of the entire exhaust system to match then I can't see that you'll gain anything by just increasing the diameter of the CAT to be honest.
    gonna fit a 3" exhaust at a later date when funds allow, but as i'm changing the turbo i thought i'ds decat aswell while i'm in the same area

  25. #24
    Lee Goodall's Avatar
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    Quote Originally Posted by jamie226bhp View Post
    gonna fit a 3" exhaust at a later date when funds allow, but as i'm changing the turbo i thought i'ds decat aswell while i'm in the same area
    I see.. in that case yeah do it.

    Remember you need a friendly MOT man or you'll be swapping for a CAT again for each MOT.

  26. #25
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    Quote Originally Posted by Lee Goodall View Post
    I see.. in that case yeah do it.

    Remember you need a friendly MOT man or you'll be swapping for a CAT again for each MOT.
    exactly what i'll be doing, just need to get some good prices on exhausts now

 

 

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