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Thread: cat efficiency too low

  1. HaydenE
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    cat efficiency too low

    05-13-2012 12:02 AM #1
    i just replaced my oem exhaust with a turbo back system and now my cel is on saying my cat efficiency is too low. what is this about? would getting it tuned fix this? if not could i clean my o2 sensors for a fix?
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  3. Smoky_Llama
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    05-13-2012 01:11 AM #2
    Either a stage 2 tune or an o2 spacer would fix the problem.
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  4. bryangb
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    05-13-2012 12:06 PM #3
    A stage 2 tune will solve this problem. An o2 spacer will also fix the issue if a tune is too pricey

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  5. 08Murdered
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    05-13-2012 12:11 PM #4
    Quote Originally Posted by bryangb View Post
    A stage 2 tune will solve this problem. An o2 spacer will also fix the issue if a tune is too pricey
    I have a stage 2 united motor sports tune and my cel is still on....
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  6. bryangb
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    05-13-2012 05:02 PM #5
    Quote Originally Posted by 08Murdered View Post
    I have a stage 2 united motor sports tune and my cel is still on....
    There is your problem. APR

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  7. HaydenE
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    05-13-2012 06:43 PM #6
    what do you think of revo?
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  8. anteramk5jetta
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    05-13-2012 08:50 PM #7
    If you did a cat-less downpipe thats why your check engine light came on, and some of the "high performance" cat's do not perform like OEM and are usually slightly out of spec for the OEM computer. Quick and easiest way would be a O2 spacer for the downstream O2
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  9. HaydenE
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    05-14-2012 12:51 AM #8
    yeah its a cat less down pipe. i have a spacer on the way so it should be fixed soon thanks everyone.
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  10. HaydenE
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    05-14-2012 03:15 PM #9
    haha didnt even need the spacer. i simply misplaced the o2 sensor before the cat not after i just had it on a lift at my friends work and noticed it.
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  11. bryangb
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    05-14-2012 05:46 PM #10
    Quote Originally Posted by HaydenE View Post
    haha didnt even need the spacer. i simply misplaced the o2 sensor before the cat not after i just had it on a lift at my friends work and noticed it.
    At least it was an easy fix. You could always return the spacer

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  12. HaydenE
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    05-15-2012 12:31 AM #11
    I'll probably try to sell it at th mk5 meet at SOWO this weekend.
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  13. 08Murdered
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    05-15-2012 12:06 PM #12
    Quote Originally Posted by bryangb View Post
    There is your problem. APR
    My tuner said he likes United Motorsport's over APR and the others...I don't think its a stage 2, it feels like a stock car still. I don't have a boost gauge to read the level or boost but the thing isn't very impressive.
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  14. CANABAN
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    05-15-2012 02:44 PM #13
    Quote Originally Posted by bryangb View Post
    There is your problem. APR
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  15. blue98jettavr6
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    05-15-2012 05:42 PM #14
    Quote Originally Posted by anteramk5jetta View Post
    If you did a cat-less downpipe thats why your check engine light came on, and some of the "high performance" cat's do not perform like OEM and are usually slightly out of spec for the OEM computer. Quick and easiest way would be a O2 spacer for the downstream O2
    X2 as far as the engine know you have a cat and it thinks its not working because the after cat/ 2nd O2 is detecting bad emissions.


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  16. meanopause
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    05-15-2012 07:10 PM #15

    inefficient cat.
    useless
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