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Old 11-11-2001, 08:43 PM   #1
scootr
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Default Where does my O2 sensor go?

I am using a WRX downpipe and am wondering where my front O2 sensor goes? There is a spot right after the passenger side manifold but that seems a little close. Also is it the front one I tap the A/F guage wire into? On the turbo kits I have seen the Bung for the sensor is right on top of the downpipe.

scootr
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Last edited by scootr; 11-12-2001 at 03:17 AM.
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Old 11-11-2001, 09:30 PM   #2
kastle
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I just can't resist the urge to shoot here...

Quote:
I am using s WRX downpipe and am wondering where my front O2 sensor goes?
Bend over and I'll show ya.....
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Old 11-11-2001, 11:38 PM   #3
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I don't think that placement will give him the O2 reading he's looking for.
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Old 11-12-2001, 03:11 AM   #4
scootr
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Come on now Kastle, leave me alone. Besides is there an answer or am I just being really dumb.
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Old 11-12-2001, 08:55 AM   #5
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sorry, I just couldn't resist the oppertunity on that one....
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Old 11-12-2001, 10:54 AM   #6
Jewbaru
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The Front O2 sensor goes before the Cat converter.

If you are using the stock ECU/O2 sensor, you cannot connect an A/F guage to the front sensor, you have to use the rear (after the cat).
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Old 11-12-2001, 02:08 PM   #7
iodine23
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Quote:
Originally posted by Jewbaru

If you are using the stock ECU/O2 sensor, you cannot connect an A/F guage to the front sensor, you have to use the rear (after the cat).
Is this because of wide/narrow band issues? Or perhaps the wrong number of leads? I was under the impression I could wire up an aftermarket gauge no problem, woops!
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Old 11-12-2001, 02:45 PM   #8
HndaTch627
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on MY00-01 vehicles they use Wideband front 02 Sensors. YOU cannot hook an aftermarket guage up to it, you will need another 02 sensor for the guage itself. Also the front 02 should go inbetween the up-pipe an dhte first cat somwhere. Now some cars can get picky and give you a a P0131 IIRC for HO2S1 slow response. Becareful with your choice of placement.

Jeremy
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Old 11-12-2001, 02:48 PM   #9
Jewbaru
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it's because of the wide/narrow bands. It's a VERY complicated O2 sensor.

There are actually 3 pickups in the front O2, one outputs 0.2-4.8v, another outputs 2.4-2.7v, and the last outputs 2.8-3.2v. Basically, the car is checking, then rechecking the mixture to the finest detail. There isn't an A/F guage out there that we could use without shelling out some serious cash. You're better off having a regular O2 welded into the header (I got a non heated GM one, 17.99, and I can upgrade it when I feel the need).

For refrence, you want an O2 sensor that outs 0-1v for the A/F guage.
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Old 11-12-2001, 03:17 PM   #10
HndaTch627
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yeah any GM one from the late 80's to early 90's off an 3.1 litre V-6 or 4 cylinder 2.5...no qaud 4's but they were actually short might be better.

JEREMY
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Old 11-12-2001, 03:31 PM   #11
Jewbaru
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remember, you're better off getting a US thread O2 sensor considering there a hell of a lot easier to find in Autozone if the origional craps out.
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