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    Thread: cat efficiency too low

    1. Semi-n00b
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      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?

    2. Member Smoky_Llama's Avatar
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      05-13-2012 01:11 AM #2
      Either a stage 2 tune or an o2 spacer would fix the problem.
      Need Vag-Com in Eastern Nebraska and Western Iowa? Send me a PM.

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    3. Member bryangb's Avatar
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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
      // Open Road Tuning
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    4. 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....

    5. Member bryangb's Avatar
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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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    6. Semi-n00b
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      05-13-2012 06:43 PM #6
      what do you think of revo?

    7. Member anteramk5jetta's Avatar
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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

    8. Semi-n00b
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      MK2 86 gti 16v, MK2 91 gti 16v, MK5 08 gti 2.0T 96 E36
      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.

    9. Semi-n00b
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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.

    10. Member bryangb's Avatar
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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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    11. Semi-n00b
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      MK2 86 gti 16v, MK2 91 gti 16v, MK5 08 gti 2.0T 96 E36
      05-15-2012 12:31 AM #11
      I'll probably try to sell it at th mk5 meet at SOWO this weekend.

    12. 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.

    13. Member CANABAN's Avatar
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      05-15-2012 02:44 PM #13
      Quote Originally Posted by bryangb View Post
      There is your problem. APR

    14. Member blue98jettavr6's Avatar
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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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    15. Member
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      05-15-2012 07:10 PM #15

      inefficient cat.

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