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Old 12-03-2003, 05:27 PM   #1
blackbok
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Question Rear O2 sensor replaced under warranty

I just had my rear O2 sensor replaced under warranty (I got a cell) at the dealership. I swapped out my Cobb intake and put the stock airbox/snorkel back on. When I talked to the service person, she said that the fouled sensor may have been a result of the Stromung catback. Is his really likely? I've had it on for over a year, no CEL. I've also had the Cobb on for the same time. Which is more likely to have produced an O2 fouling? The olnly things I have changed recently are:

1- about a month ago I put a new donut gasket at the cat/midpipe connection because of a condensation drip that has been bothering me. I also used some high temp gasket seal on both that connection and the muffler/midpipe flange. Sealed fine, but could that cause TOO much of a seal and foul the sensor?

2- About a week ago I wraped my Cobb intake in insulation. Could that have caused too much of a cold air/fuel mix?

I want to solve whatever caused the sensor to go bad, because it was made clear that if it happened again, they would blame the exhaust and not fix it, and SOA COULD void my entire warranty.

An thoughts?
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Old 12-03-2003, 07:56 PM   #2
m750
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high temp gasket seal is most likely your problem... and they can only void the specific parts associated with the warentee voiding part, and they have to prove that it's what caused the problem. I doubt your 02 will foul again, but that's just speculation.
AO

edit -
What I'm getting at is excess seal burning off upstream causing a fouling of the 02 sensor.

Last edited by m750; 12-03-2003 at 08:01 PM.
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Old 12-03-2003, 07:57 PM   #3
Cujo31
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sounds like they're grasping at ideas to explain why all impreza o2 sensors show codes when you just look at them wrong.


I've been told my codes are from the catback i have on also. I have gotten a new front & rear sensors, and new converter under the emissions 8yr/80000 mile warranty free. My general warranty has been up for like 1.5years.

insulation on your intake isn't going to do it i think.

Just keep your intake, plugs, wires, exhaust pipes, flanges and connections well maintained and that's about all the prevention you can do it seems.
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Old 12-03-2003, 10:39 PM   #4
blackbok
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Quote:
Originally posted by m750

edit -
What I'm getting at is excess seal burning off upstream causing a fouling of the 02 sensor.
that's what I was assuming too. Now, how long do you think before it can foul up the new sensor? I'm going to take it off, but won't be able to get to it until tomorrow after work(50 miles later).
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Old 12-04-2003, 12:36 AM   #5
blackbok
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Quote:
Originally posted by blackbok
that's what I was assuming too. Now, how long do you think before it can foul up the new sensor? I'm going to take it off, but won't be able to get to it until tomorrow after work(50 miles later).
Well, being as neurotic as I am, i couldn't wait. i set up the work light and got under the car.
Man, that silacone gasket maker MUST have been the cause. It was caked it the midpipe flange.... all burnt and crusty. I spent a good 10 minutes wire brushing ALL of that crap out. I'm pretty sure that was the culprit. I put on a new cat gasket and re-assembled. I will now cross my fingers that no cell comes back.

Also, I never noticed until after I got my CEL, but on startup (when the key is fisrt turned and the battery/abs and whatever other lights momentarily turn on) does the CEL do the same? Mine does now, just cannot remember if it's normal, or an ominous sign...
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Old 12-04-2003, 08:39 AM   #6
m750
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It should only burn off once, once it's burned, I would assume it would have been fine. Yes the Cel will come on momentarily when the car does it's light/ gauge check.
AO
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