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Old 10-21-2004, 02:48 PM   #1
Scooby Newbie
Member#: 64782
Join Date: Jun 2004
Location: Rochest'a NY
2002 Impreza 2.5RS
Platinum Silver Metalic

Default replacing O2 sensor

My heater circuit for my front o2 sensor went, and i just got a deal on one, so i was wondering if anyone had some advice about how to replace it, i noticed the wire was protected by thick metal, what do i do about it, how does the wire attach to the sensor? I know people have done this, Got Pics?
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kodakeos is offline   Reply With Quote
Old 10-21-2004, 05:43 PM   #2
Scooby Newbie
Member#: 62819
Join Date: May 2004
Chapter/Region: MWSOC
Location: Ann Arbor, MI
2002 Outback


A deal on the heater circuit? You don't need to worry about the wiring directly connected to the sensor, there's a connector up higher level with the engine for both O2 sensors. As for getting it out, I literally had to take that section of exhaust system out before I could get the elbow room to muscle it loose. There may very well be a better way, but I tried every tool I had with nothing coming loose. Sorry if this helps...
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Old 10-22-2004, 05:06 PM   #3
Scooby Newbie
Member#: 18797
Join Date: May 2002
Chapter/Region: VIC
Location: New Westminster, BC, Canada
MY06 WRX Wagon


Hi I have taken mine out a couple of times. I just unplugged it from the contector (reach it from engine bay) and crawled underneith (parked over a ditch). I believe its a 22mm wrench. It was never that tight.

When you put the new sensor in. Make the wiring does not dangle free. Its pretty staight forward. Don't forget the anti seize on the threads.

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Old 10-22-2004, 05:42 PM   #4
Scooby Newbie
Member#: 64782
Join Date: Jun 2004
Location: Rochest'a NY
2002 Impreza 2.5RS
Platinum Silver Metalic


cool, thanks =D looks like a got a nice saturaday job for sometime... now if saturdays would be NICE again...
kodakeos is offline   Reply With Quote
Old 10-22-2004, 06:14 PM   #5
Scooby Specialist
Member#: 31035
Join Date: Dec 2002
Chapter/Region: NESIC
Location: Boston
13 Ford Explorer
14 ISM STi


I took a quick look around and don't seem to have a picture of the connector from when I did my exhaust. I believe it's in the same place on your car as the GC8 though. On my car, you stand on the passanger side of the engine bay right by the strut tower. Look down towards your axle and you should see a wire coming up from the exhaust. Follow that up and there should be a connector with a grey latch on it. Indo the latch and pull the harness apart. It should be a 6-wire connector. If you really need it I could probably take a pic of my car with a flashlight, but it's pretty straight forward.
bigdweeb is offline   Reply With Quote

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