Welcome to the North American Subaru Impreza Owners Club Wednesday November 26, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Normally Aspirated Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 03-24-2005, 08:36 PM   #1
iwhitey
Scooby Newbie
 
Member#: 82841
Join Date: Mar 2005
Impreza GC8 Cobb header burning up o2 sensors

I'm on the look out to buy either a Cobb or Borla header (with Stromung exhaust) and have read in other Subaru forums that quite a few people have had to replace burnt out O2 sensors after they've fitted a Cobb header. Has anyone had experince of this? it is something I'll have to constantly check if I do go with Cobb? or is there a remedy to stop this from happening?
Any help is much appreciated, thanks
* Registered users of the site do not see these ads.
iwhitey is offline   Reply With Quote
Old 03-24-2005, 09:32 PM   #2
bongchild
Scooby Newbie
 
Member#: 28352
Join Date: Oct 2002
Chapter/Region: SWIC
Location: Tolleson, Arizona
Vehicle:
1993 1.8 helL (AWD)
'06 Corolla XRS!

Default

Hm, I think that all aftermarket headers throw an incurable CEL for some reason. (im sure someone will correct me if im wrong) There are various fixes out there for it but none are effective as far as i can tell. Maybe the O2 sensor burning out has something to do with it?
bongchild is offline   Reply With Quote
Old 03-25-2005, 12:53 PM   #3
ttboy19
Scooby Specialist
 
Member#: 38043
Join Date: Jun 2003
Chapter/Region: Tri-State
Location: New Jersey
Vehicle:
2004 impreza rs4sale
'10 Legacy 2.5GT

Default

Mann, that would really suck if my 02 sensor was burnt. I have the Cobb headers(catless) and a MIL Eliminator. Just recently now, my CEL stays on. What's going on?
ttboy19 is offline   Reply With Quote
Old 03-25-2005, 01:01 PM   #4
Boost-Free Subee
Scooby Specialist
 
Member#: 61052
Join Date: May 2004
Chapter/Region: NESIC
Location: Nashua, NH
Vehicle:
1999 2.5 RS
White

Default

i've had the borla header for 4 years now, and no cel. can't comment on others. haven't gotten another one yet.
Boost-Free Subee is offline   Reply With Quote
Old 03-25-2005, 02:49 PM   #5
Aphex28
Scooby Specialist
 
Member#: 11506
Join Date: Oct 2001
Chapter/Region: NESIC
Location: Nashua, NH
Vehicle:
2015 WRX
WRB +TE37-TA

Default

yah borla header for my car for more than 1 year with the pony express MIL and no CEL's at all...
Aphex28 is offline   Reply With Quote
Old 03-25-2005, 04:20 PM   #6
Matt Monson
Scooby Guru
 
Member#: 832
Join Date: Jan 2000
Chapter/Region: RMIC
Location: Teh Ghetto Garage, CO
Vehicle:
99 2.5RS, '85 911
'73 914 and 2012 BRZ

Default

The Cobb headers can burn out your front O2 sensor( A/F) not your rear (lambda). What will happen if this occurs is that the car will bog around 3000rpms because it will dump a bunch of fuel in there and nearly stall. It takes quite a while for it to happen. But if you are worried about the $80 for an O2 sensor, get some other headers and lose 5 or more HP. It is always a balancing act...
Matt Monson is offline   Reply With Quote
Old 03-25-2005, 07:24 PM   #7
mrpedal
Scooby Newbie
 
Member#: 71361
Join Date: Sep 2004
Chapter/Region: BAIC
Location: SFBay
Vehicle:
2000 Impreza 2.5RS
silver

Default

Matt, you know what causes this to happen? Thinking if we knew why they died might be able to change something to fix it. Is this a cobb only thing too, or would TWEs do it too? At least how frequent did it got bad- 1 month? 6months? 2 years?
mrpedal is offline   Reply With Quote
Old 03-30-2005, 08:20 PM   #8
iwhitey
Scooby Newbie
 
Member#: 82841
Join Date: Mar 2005
Default

Is there a large performance difference between the equal length Cobb headers and the Borla's? I've read that the Borla's have abetter sound to them but would I be sacrificing some performance if I went with them over the Cobb's?
iwhitey is offline   Reply With Quote
Old 03-30-2005, 10:45 PM   #9
BlackAndBlue
Scooby Specialist
 
Member#: 40617
Join Date: Jul 2003
Chapter/Region: Tri-State
Location: Greater NYC
Default

the cobb headers provide more torque and hp but are equal length, so the sound is different, no boxer rumble.

i wonder if the rear mechanical cel fix if applied to the front o2 sensor will elongate/stop the 02 sensor from burning out. do you know why this happens so I can try to finda way around it?
BlackAndBlue is offline   Reply With Quote
Old 03-30-2005, 11:57 PM   #10
Keith Cournoyer
Scooby Newbie
 
Member#: 16764
Join Date: Mar 2002
Location: Somerville, MA
Default

MRT's don't burn them out.
Keith Cournoyer is offline   Reply With Quote
Old 03-31-2005, 01:11 AM   #11
RayQuon
Scooby Specialist
 
Member#: 43259
Join Date: Sep 2003
Chapter/Region: W. Canada
Location: Calgary, AB
Vehicle:
1999 2.0RS
RBP

Default

I used borlas for two months, and then went to TWEs. I only had the TWEs on for a few days, and I blew my front O2 sensor. I'd say the TWEs were innocent though, and the damage was done when I was still using the borlas. Hard to know for sure, but I don't think a few days would be enough to blow the sensor.
RayQuon is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
FS : Full 02-07 N/A Exhaust, Borla/Stromung/O2 Sensor Ext. Donutz Engine/Power/Exhaust 7 06-12-2010 09:39 PM
Setting up AEM WB o2 sensor on Cobb DP magicstop Newbies & FAQs 9 06-14-2009 09:49 PM
Lean burn on oem ECU - use PIC to offset O2 sensor? ahains Engine Management & Tuning 23 09-13-2005 02:18 PM
Complete Sti turbo kit with O2 sensors/ UP/DP/header BistroSti Mid West Subaru Owners Club Forum -- MWSOC 3 08-22-2004 08:15 PM
I eat up o2 sensors Ralley King Normally Aspirated Powertrain 13 02-07-2001 09:36 PM


All times are GMT -4. The time now is 01:45 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.