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Old 07-06-2009, 11:06 PM   #1
alwrxwu
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Member#: 63294
Join Date: Jun 2004
Chapter/Region: E. Canada
Vehicle:
2002 WRX Wagon
Blue

Default O2 Sensor Question

I recently got a Check Engine light and it was diagnosed to be a faulty O2 sensor. I have an 02 WRX wagon.

Is this something I can do myself? I've been looking around the web and there are so many O2 sensors for Subarus from $48 to $175(?)

Which one do I need? Does the car only have 2 O2 sensors are or are there more than one in the front? I was told the one in the front was faulty.

Thanks all for the help,
alwrxwu
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Old 07-06-2009, 11:18 PM   #2
rexman2002
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You need the front O2 sensor (A/F) located in the exhaust manifold. You can get one online for 160 shipped. Check with https://www.subarugenuineparts.com/oe_parts_cat.html Get oem, you will have no issues, don't go aftermarket.

copy&paste the number: 22641AA042 in the oem parts catalog.

looks like the price went up 168 plus shipping.
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Old 07-07-2009, 07:36 AM   #3
alwrxwu
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Thank you! I'm hoping I can do this myself although the dealer told me that only they can do it because they have to reprogram something.
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Old 07-07-2009, 02:59 PM   #4
rexman2002
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get this tool to remove the old sensor. I got mine from autozone, ~10 bucks.

Crows foot removal tool



If you're still on stock exhaust manifold, you might have to cut a bit of the heatshield in order to get to the sensor. You need to remove passanger front wheel to get to the sensor. When I did mine, I had borla header on, so had no issues getting to the sensor.
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Old 07-07-2009, 04:20 PM   #5
alwrxwu
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The dealer keeps insisting that they need to reset something and reprogram something if I were to change the O2 sensor and that I need to bring the car in. Huh? I'm confused...I figured I just needed to clear the code with my Access Port.

How long can I run the car with the front O2 sensor broken? I have to order the part and wait for it to ship to me, etc.
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Old 07-07-2009, 04:40 PM   #6
jonman24680
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1. The sensor is threaded into the exhaust manifold.
2. It can be difficult to remove unless a special anti-seize compound is coated onto its threads.
3. Torque the sensor to 30 foot-pounds using a special socket.
4. A sensor that is too loose or a cracked exhaust manifold can result in a lean signal to the computer.
5. Check the vents in the thimble of a replacement O2 sensor.
6. There should be the same number of holes and they should face clockwise or counterclockwise like the ones on the original sensor.
7. Installing the wrong sensor can result in slower cross counts.


This is straight from Autozone repair guide.

Doesn't say anything about resetting or reprogramming anything.
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Old 07-07-2009, 05:05 PM   #7
rexman2002
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Quote:
Originally Posted by alwrxwu View Post
The dealer keeps insisting that they need to reset something and reprogram something if I were to change the O2 sensor and that I need to bring the car in. Huh? I'm confused...I figured I just needed to clear the code with my Access Port.

How long can I run the car with the front O2 sensor broken? I have to order the part and wait for it to ship to me, etc.
I had that code pop up at around 130k miles on my car.

What I did. Bought a new oem sensor, installed it, started the car, and code was gone. I did not have to reprogram anything. I think the dealer is pulling a fast one on you. they love to rip people off.
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Old 07-07-2009, 05:34 PM   #8
jonman24680
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I personally would replace it myself and if the code is still there then go have them reset it. That way they don't get you for labor.
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Old 07-10-2009, 07:42 PM   #9
Infra_red
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Having hell removing the old sensor. My O2 socket keeps hitting the subframe causing it to strip off sensor. Can I easily remove that pipe section to get a good grip? I have been out front from 1:45 pm til 6 and still no luck. Please help me, please baby, baby please!!!
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Old 07-10-2009, 08:49 PM   #10
UkNuck
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soak it in PB Blaster and try again tomorrow

yes you can remove the RH collector but you'll probably need new gaskets to the uppipe and crosspipe when you refit it
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Old 07-10-2009, 09:32 PM   #11
rexman2002
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maybe heat it up with a torch??
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Old 07-10-2009, 10:16 PM   #12
Infra_red
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Thanx, and I will try again this weekend. I also noticed that my O2 socket is longer than the one in this http://www.scoobymods.com/oxygen_sen...64.html?t=5464 post on scoobymods, probably causing my subframe problems. Maybe I should find a smaller one. Shame I waited for almost a week for the one I ordered from ebay.
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Old 07-11-2009, 02:49 AM   #13
strohausii
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^^ just make sure you are removing the O2 sensor, and not the EGT probe (uppipe).

PB Blaster is definately helpful. I tend to replace my O2 sensors (yah both cars), while the exhaust is still warm (not hot).

And both (Mostly New England driven) cars gave up the old O2's without incident.
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