EJ20G/K Stock O2 Sensor Location

dr3w · 05-20-2010, 10:46 PM

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 ?

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Jaxx · 05-20-2010, 10:53 PM

g is in the right hand headder the k is in the dp neck

69subaru360 · 05-20-2010, 11:02 PM

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.

suberdave · 05-21-2010, 10:35 AM

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

-=Suberdave=-

Cbgrandtheftauto · 05-21-2010, 11:13 AM

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

Eatoniashoprat · 05-21-2010, 12:14 PM

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.

05-20-2010, 10:46 PM	#1
dr3w Scooby Specialist Member#: 222318 Join Date: Sep 2009 Chapter/Region: E. Canada Location: Montreal Vehicle: 1993 RHD GC8 Silver	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.

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05-20-2010, 10:53 PM	#2
Jaxx Scooby Guru Member#: 177 Join Date: Aug 1999 Chapter/Region: NWIC Location: Austin, Texas, USA Vehicle: The 93 W/EJ20K-sold Subaru-less :(	g is in the right hand headder the k is in the dp neck

05-20-2010, 11:02 PM	#3
69subaru360 Scooby Guru Member#: 159682 Join Date: Sep 2007 Chapter/Region: NESIC Location: Maine Vehicle: 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.

05-21-2010, 10:35 AM	#4
suberdave NASIOC Supporter Member#: 101865 Join Date: Dec 2005 Chapter/Region: NWIC Location: Covington, WA Vehicle: 88 GL-10 STi silver	i too moved my O2 from the manifold to the downpipe. works just fine... -=Suberdave=-

05-21-2010, 11:13 AM	#5
Cbgrandtheftauto Scooby Specialist Member#: 184977 Join Date: Jul 2008 Chapter/Region: South East Location: TN Vehicle: 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

05-21-2010, 12:14 PM	#6
Eatoniashoprat Scooby Newbie Member#: 143416 Join Date: Mar 2007 Chapter/Region: W. Canada Location: Saskatoon Vehicle: 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.