Welcome to the North American Subaru Impreza Owners Club Tuesday March 2, 2021
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
Go Back   NASIOC > NASIOC Technical > Pre-2002 Factory Turbo 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.

* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Thread Tools Display Modes
Old 05-20-2010, 10:46 PM   #1
Scooby Specialist
Member#: 222318
Join Date: Sep 2009
Chapter/Region: E. Canada
Location: Montreal
1993 RHD GC8

Default EJ20G/K Stock O2 Sensor Location

Bought my car with a tubular manifold so i never got to see the stock manifold o2 sensor location.

It's currently in one of the manifolds runners what i was wondering is if it should be in the downpipe right after the turbo which make's more sense to me ?
* Registered users of the site do not see these ads.
dr3w is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 05-20-2010, 10:53 PM   #2
Scooby Guru
Member#: 177
Join Date: Aug 1999
Chapter/Region: NWIC
Location: Austin, Texas, USA
The 93 W/EJ20K-sold
Subaru-less :(


g is in the right hand headder the k is in the dp neck
Jaxx is offline   Reply With Quote
Old 05-20-2010, 11:02 PM   #3
Scooby Guru
Member#: 159682
Join Date: Sep 2007
Chapter/Region: NESIC
Location: Maine
1995 WRX
2015 F150


I have an aftermarket downpipe on my EJ20G that has a bung in it. I put the O2 sensor there in the DP. It just seems like a more logical place for it. I know it's just a narrowband sensor, but O2 sensors are more accurate when not subjected to pre turbo exhaust pressure. It's also less likely to get damaged by road debris in the DP, unlikely I know, but it happens. Mine runs fine with it moved to the DP, no issues.
69subaru360 is offline   Reply With Quote
Old 05-21-2010, 10:35 AM   #4
NASIOC Supporter
Member#: 101865
Join Date: Dec 2005
Chapter/Region: NWIC
Location: Covington, WA
88 GL-10 STi


i too moved my O2 from the manifold to the downpipe. works just fine...

suberdave is offline   Reply With Quote
Old 05-21-2010, 11:13 AM   #5
Scooby Specialist
Member#: 184977
Join Date: Jul 2008
Chapter/Region: South East
Location: TN
99 Impreza RS
'13 BRZ


I run PFC so I didnt need a 02 sensor but I did install the wb-02 in the bung right in the mouth of the dp
Cbgrandtheftauto is offline   Reply With Quote
Old 05-21-2010, 12:14 PM   #6
Scooby Newbie
Member#: 143416
Join Date: Mar 2007
Chapter/Region: W. Canada
Location: Saskatoon
1971 Super Beetle
EJ20g Platinum Grey


I thought the reason they had it in the manifold is because its a lot closer to where the action is, and since its only used for idle/cruise feedback a) there isn't as pressure at these operating points when the sensor is actually used and b)it can respond a lot faster to needed changes.

Although everything is happening fast enough I can't see having it in the downpipe being an issue.
Eatoniashoprat is offline   Reply With Quote

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
stock o2 sensor location alphagoose Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 11 09-26-2007 02:48 PM
EJ20G TWO wire O2 sensor AsphaltsCry Subaru Conversions 3 03-30-2005 02:01 PM
WBO2 in rear O2 sensor location drdeuce Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 11 09-14-2004 02:16 PM
O2 sensor location?? Replacing..DIY job? Sobelizard109 Legacy Forum 4 03-06-2003 10:45 PM
O2 sensor location and wire to tap for AFR? camz911 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 1 04-11-2002 05:22 PM

All times are GMT -4. The time now is 07:57 PM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2021 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.