WTB/B: '02 WRX front Oxygen Sensor - Subaru Enthusiasts Car Club of the Sierras

sperry · 2009-08-10, 10:33 AM

Looks like I've got a fouled front O2 sensor on my WRX (ECU sees intermittent data coming from it... works for a minute or two, then sticks reading at 14.7 while the wideband shows the car go rich), and the generic Bosch replacement I picked up from Kragen throws a P0031 code.

Does anyone have a OEM O2 sensor I can borrow/buy to try to get my stock ECU up and running for smog? I don't need the sensor normally because the Hydra only runs the wideband (which is why my OEM sensor fouled... it was in the headers w/o being powered), but in order to pass smog I need to tune my stock ECU for blow-thru MAF use, and I need at least the front 02 sensor working for closed loop to keep the AFRs stoich.

Dean · 2009-08-10, 11:35 AM

I have an '04 STI one or two lying around.

Also, can you program the output from your wide band to emulate narrow? The LC-1 lets you.

sperry · 2009-08-10, 12:48 PM

Quote:

Originally Posted by Dean

I have an '04 STI one or two lying around.

Also, can you program the output from your wide band to emulate narrow? The LC-1 lets you.

Actually, I just tried that at lunch. I'm starting to think my issue is not the O2 sensor, since I was briefly able to get the narrowband O2 sensor to read 25:1 from the LC-1's simulated output, then it went back to 14.7:1 and stuck there... I may have a bad connector somewhere. Ugh.

It would still be nice to try a known working O2 sensor though and see if I have the same issues.

Dean · 2009-08-10, 01:00 PM

Contact cleaner at the ECU might be in order. And check for a pushed out/bent pin if you have been plugging and unplugging those to switch ECUs.

I have a known good one from '04 just sitting on a box in the garage the other '07 is in the exhaust manifold for the STI sitting on the floor. You are welcome to borrow one.

GusGus91 · 2009-08-10, 02:30 PM

I sent you a pm. You can just have it if you still need it.

sperry · 2009-08-10, 02:34 PM

Quote:

Originally Posted by GusGus91

I sent you a pm. You can just have it if you still need it.

Cool man, thanks for the offer! I've got a pipe wrench and some vice-grips, so I should be able to yank it out of whatever it's stuck in, but I'm going to give the LC-1 simulation mode one more chance after double checking all my plugs, as that would be the ideal way to run the stock ECU.

I'll PM you if I need to take you up on that sensor!

GusGus91 · 2009-08-10, 03:01 PM

Okay, sounds good!

van · 2009-08-10, 07:30 PM

I have the "special" slotted o2 socket if you need it for removal

sperry · 2009-08-10, 07:53 PM

Quote:

Originally Posted by van

I have the "special" slotted o2 socket if you need it for removal

Those only help if you haven't already rounded the sensor off like GusGus did apparently. Since my car is apart so frequently, I don't think there's a single frozen bolt anywhere on the car... last night when I swapped out my O2 sensor, it was a cinch w/ a plain old open-ended wrench.

ScottyS · 2009-08-10, 08:12 PM

Quote:

Originally Posted by sperry

Those only help if you haven't already rounded the sensor off like GusGus did apparently. Since my car is apart so frequently, I don't think there's a single frozen bolt anywhere on the car... last night when I swapped out my O2 sensor, it was a cinch w/ a plain old open-ended wrench.

Sounds like mine.....

2009-08-10, 10:33 AM	#1
sperry The Doink Real Name: Scott Join Date: Nov 2002 Location: Portland, OR Posts: 20,335 Car: '09 OBXT, '02 WRX, '96 Miata Class: PDX/TT-6 The way out is through	WTB/B: '02 WRX front Oxygen Sensor Looks like I've got a fouled front O2 sensor on my WRX (ECU sees intermittent data coming from it... works for a minute or two, then sticks reading at 14.7 while the wideband shows the car go rich), and the generic Bosch replacement I picked up from Kragen throws a P0031 code. Does anyone have a OEM O2 sensor I can borrow/buy to try to get my stock ECU up and running for smog? I don't need the sensor normally because the Hydra only runs the wideband (which is why my OEM sensor fouled... it was in the headers w/o being powered), but in order to pass smog I need to tune my stock ECU for blow-thru MAF use, and I need at least the front 02 sensor working for closed loop to keep the AFRs stoich. __________________ Is you is, or is you ain't, my con-stit-u-ints?

2009-08-10, 11:35 AM	#2
Dean Señor Cheap Bastarde Real Name: Dean Join Date: May 2003 Location: $99 Tire Store Posts: 9,294 Car: $.04 STI Class: Fast,Cheap & Reliable=STI Deal, did somebody say Deal? Oh, Dean, yeah that's me.	I have an '04 STI one or two lying around. Also, can you program the output from your wide band to emulate narrow? The LC-1 lets you. __________________ I am a Commodore PET --- Now get off my lawn you kids...

2009-08-10, 01:00 PM	#4
Dean Señor Cheap Bastarde Real Name: Dean Join Date: May 2003 Location: $99 Tire Store Posts: 9,294 Car: $.04 STI Class: Fast,Cheap & Reliable=STI Deal, did somebody say Deal? Oh, Dean, yeah that's me.	Contact cleaner at the ECU might be in order. And check for a pushed out/bent pin if you have been plugging and unplugging those to switch ECUs. I have a known good one from '04 just sitting on a box in the garage the other '07 is in the exhaust manifold for the STI sitting on the floor. You are welcome to borrow one. __________________ I am a Commodore PET --- Now get off my lawn you kids... Last edited by Dean; 2009-08-10 at 01:03 PM.

2009-08-10, 02:30 PM	#5
GusGus91 EJ205 Real Name: Austin Join Date: Jan 2009 Location: South Reno, NV Posts: 1,406 Car: 2006 WRB WRX TR, 2008 LR STI Class: Too classy Dont sweat the petty... Pet the sweaty.	I sent you a pm. You can just have it if you still need it. __________________ "Like" me on facebook!http://www.facebook.com/pages/AP-Cre...2196449?v=wall _______________ 06 WRX w/ 6MT UNDER CONSTRUCTION 09 chicane yellow 370z

2009-08-10, 03:01 PM	#7
GusGus91 EJ205 Real Name: Austin Join Date: Jan 2009 Location: South Reno, NV Posts: 1,406 Car: 2006 WRB WRX TR, 2008 LR STI Class: Too classy Dont sweat the petty... Pet the sweaty.	Okay, sounds good! __________________ "Like" me on facebook!http://www.facebook.com/pages/AP-Cre...2196449?v=wall _______________ 06 WRX w/ 6MT UNDER CONSTRUCTION 09 chicane yellow 370z

2009-08-10, 07:30 PM	#8
van SECCS Brewmeister Join Date: Oct 2005 Location: on the edge of a marsh Posts: 1,451	I have the "special" slotted o2 socket if you need it for removal

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