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Old 09-27-2010, 09:34 PM   #1
LilJeb
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Default Went Catless w/ 0xy extend. CEL?

So i'm on an Ebay UEL header, catless custom track pipe w/ both o2 bungs (one with the extender for the CEL fix) and a ebay 3" exhaust

Took it to my local auto parts store and got him to get the codes. They all relate to the o2 sensor
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Old 09-27-2010, 10:23 PM   #2
kewlboxer2
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of course you will get cat codes.. you dont have any!
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Old 09-27-2010, 10:32 PM   #3
LilJeb
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But I have o2 sensors in both bungs. i thought if you had them both plugged in they dont throw codes. thats why companys make track pipes with bungs
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Old 09-28-2010, 12:08 AM   #4
kewlboxer2
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You are catless. You are throwing cat deficiency codes. Your car thinks your cats are toast, which they are.
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Old 09-28-2010, 12:14 AM   #5
renyo
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Unintentional mistaken word choice = pun. I like it.
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Old 09-28-2010, 02:40 PM   #6
EdHilario
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P0420 I bet
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Old 09-28-2010, 02:50 PM   #7
RaineMan
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Oy... we've got a live one here.

Your O2 sensors are throwing codes b/c you don't have any cats.

What did you think... you could just remove a vital piece of the emissions control system and the car wouldn't notice as long as you replaced the sensors?

Do people these days actually read and try to learn things before they start modding away, or is the new popular thing just to throw on parts and see what happens?
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Old 09-28-2010, 03:19 PM   #8
Skidd
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I have no cat in my exhaust.
I've managed to keep Cat Related CEL codes away with an old Pony Express MIL Eliminator.
Going on 4+ years now. Ok.. so I had the cat efficincey code a few months back, but that was my fault due to a piss poor o2 bung (way too tall).
But, I"m also in a 2000 car. I believe my ECU is a little more forgiving for cat removal than some of the newer ECUs.

Last edited by Skidd; 09-28-2010 at 11:34 PM.
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Old 09-28-2010, 04:26 PM   #9
GEE-OTTO
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Quote:
Originally Posted by LilJeb View Post
So i'm on an Ebay UEL header, catless custom track pipe w/ both o2 bungs (one with the extender for the CEL fix) and a ebay 3" exhaust

Took it to my local auto parts store and got him to get the codes. They all relate to the o2 sensor
Tune it or put the cat back in or get lucky with a MIL eliminator
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Old 09-28-2010, 04:50 PM   #10
WeldingHank
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what are the exact code numbers?
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Old 09-28-2010, 08:25 PM   #11
LilJeb
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Quote:
Originally Posted by RaineMan View Post
Oy... we've got a live one here.

Your O2 sensors are throwing codes b/c you don't have any cats.

What did you think... you could just remove a vital piece of the emissions control system and the car wouldn't notice as long as you replaced the sensors?

Do people these days actually read and try to learn things before they start modding away, or is the new popular thing just to throw on parts and see what happens?
I have researched. I just thought that as long as o2 sensors could regulate flow that no CEL would be thrown. Obviously not.

But thank you for being the typical internet troll smart-ass even though I'm reaching out and nicely asking for help. **** off please. thanks

Quote:
Originally Posted by GEE-OTTO View Post
Tune it or put the cat back in or get lucky with a MIL eliminator
I have the MIL eliminator.

Quote:
Originally Posted by WeldingHank View Post
what are the exact code numbers?
I will get them.
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Old 09-28-2010, 08:39 PM   #12
renyo
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Quote:
Originally Posted by LilJeb View Post
I have researched. I just thought that as long as o2 sensors could regulate flow that no CEL would be thrown. Obviously not.
You seem to be sadly mistaken on how O2 sensors work.
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Old 09-28-2010, 10:41 PM   #13
LilJeb
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yea i got that now. thanks for reminding me
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Old 09-28-2010, 10:45 PM   #14
LilJeb
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So Check engine is inevitable catless? legit answer time
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Old 09-28-2010, 11:33 PM   #15
Skidd
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Quote:
Originally Posted by LilJeb View Post
So Check engine is inevitable catless? legit answer time
Uh... didn't post #8 answer your question?
As in, it's "possible" to go catless and not throw a code.
Not the use of the word "possible".
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Old 09-29-2010, 12:08 AM   #16
PhilSine
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I have done the O2 extender in three catless cars and none are throwinig codes.

One was a 98 OBS, the next was a 2000 2.5RS, and the third in an 01 Forester.

All I did was buy spark plug antifoulers at the local parts store, drill them out enough for an O2 sensor to not hit on the tip, and screw them in. I'm sure there is a proper length that the offset should be as too short or too long would cause the O2 sensor to not get the proper reading. Those antifoulers must simply be the proper length.
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Old 09-29-2010, 08:43 AM   #17
LilJeb
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I see^^. Ok ima go to the autoparts store and take a look
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Old 09-29-2010, 10:17 PM   #18
subacoupe
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From what i've read and learned on this forum. If ya mod a subie get use to the mil light and if your subie makes sounds while driving turn up the radio.. hahaha
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Old 09-29-2010, 11:51 PM   #19
LilJeb
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Quote:
Originally Posted by subacoupe View Post
From what i've read and learned on this forum. If ya mod a subie get use to the mil light and if your subie makes sounds while driving turn up the radio.. hahaha
ROOOOFFLLLLLLLL
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Old 09-30-2010, 03:29 AM   #20
williaty
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With your year of car, you should be able to insert the front O2 sensor properly into the exhaust and space the rear one out slightly with a spark plug anti-fouler. For many people, that results in no P0420 DTC.
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Old 09-30-2010, 07:30 PM   #21
WeldingHank
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exact code numbers?
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Old 10-01-2010, 11:48 AM   #22
PA-Outback2000
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you r an outback sedan? the 02 spacer should work. i have a borla header, random tech high flow cat, and stromung catback. the CEL came on only after the header was installed, not when the cat was put on. i added a spacer and now no CEL.
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