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Old 07-05-2005, 05:04 PM   #1
Scooby Newbie
Member#: 90591
Join Date: Jul 2005
Default Oxygen sensor replacement

Hello everyone, I was wondering if there are any resources here that would help me in changing my O2 sensor on my 1999 Legacy. I searched the forums and site, but didn't find anything. If someone can point me in the right direction I would appreciate it. Thanks.
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Old 07-05-2005, 06:05 PM   #2
Scooby Specialist
Member#: 16874
Join Date: Mar 2002
Chapter/Region: NWIC
Location: Beaverton, OR
2008 2008 Audi RS 4
2014 Audi S Q5


try www.scoobymods.com or, maybe the best option, buy a Hayne's Manual for your car's MY. They are available at Autoparts stores and book stores, or for the cheapest, www.ebay.com has them.

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Old 07-06-2005, 10:49 AM   #3
Scooby Newbie
Member#: 90610
Join Date: Jul 2005
Location: Binghamton area
1996 Legacy L 5MT


Basically, you find the O2 sensor, remove it with an O2 sensor socket and a long breaker bar, then replace it with the new one and attach the wire.

Depending on the position of the sensor, you may need to remove some parts or loosen the exhaust system to be able to reach it. There is one sensor just before the catalytic converter, and one sensor behind the 2nd cat.

At least on my car, there is.

An o2 sensor socket costs around 10 bucks, but it is essential, in my opinion.

The sensor is tight as heck and does not want to come out easily...

P.S. Some stores will let you borrow the socket..

Matt D.
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Old 07-06-2005, 04:26 PM   #4
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Member#: 5039
Join Date: Mar 2001
Chapter/Region: South East
Location: Ocean Springs, MS
2007 Outback XT
Grey 5-speed


Dab some anti-seize on the new sensor threads in case you still have it when it needs to be swapped the next time.

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Old 07-06-2005, 04:56 PM   #5
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Member#: 60224
Join Date: Apr 2004
Chapter/Region: MAIC
Location: NOVA
2008 FXT Sports 2.5
Dark Grey Metallic


...and spray the old one down by the bung with liquid wrench or similar. Allow it time to work before attempting to remove. It would be a shame to strip the threads which can happen...
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Old 07-06-2005, 07:57 PM   #6
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Member#: 89385
Join Date: Jun 2005
Location: Loading...
many most all


7/8" open ended wrench. No big deal.
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Old 07-07-2005, 06:43 AM   #7
Hiroki Tada
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Member#: 8048
Join Date: Jul 2001
Chapter/Region: International
Location: Toronto / 神戸

I highly suggest you use an oem piece and try to stay away from the aftermarket O2 sensors. even if it does cost much more. apparently for the universal fit pieces, you need to splice away at for the connectors from the orginal sensor and re-solder them onto the new one. its easy to mess up and its just alot more trouble than its worth.
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Old 07-07-2005, 09:40 AM   #8
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Member#: 16653
Join Date: Mar 2002
Chapter/Region: NESIC
Location: Central MA
2012 Mazda 3
2013 Toyota Vanling


Meh. When I had an "emergency" o2 sensor need, all I could find at the parts store was a Bosch Universal one...

It was quite annoying to have to re-use the old connector, but it's not a huge deal. So long as you solder the wires properly and use some heatshrink, it'll hold up fine.

If you don't know how to do real wiring, or think that a crimp connector or wire nut is a proper connection, then you're gonna have problems.

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Old 09-12-2005, 12:09 AM   #9
Scooby Newbie
Member#: 95767
Join Date: Sep 2005
Location: colorado springs
1997 Gt WGN

Default easy fix

hey bro buy a universal for about 40 dollars less and it has two white wires and one black one. u can either use a soldering iron or wire connectors but u have to use the shielding that comes with it to keep the heat off of the wires or else they will be melted. also there is a hanger that holds the wires off of the exhaust and use it or else it will also get melted. it is a very easy job just take ur time us PB blaster to get it out with a open end 7/8's. and also use anti-seaze to put the new one in!
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Old 09-12-2005, 08:36 AM   #10
Scooby Newbie
Member#: 62568
Join Date: May 2004
Location: T3h Intraweb
2005 Outback 2.5 XT


I usually just use an adjustable wrench and back it out of there with no problem- no need for a special socket.
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Old 09-12-2005, 10:33 AM   #11
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Member#: 20872
Join Date: Jul 2002
Chapter/Region: Tri-State
Location: Rochester, NY
t3h rubber-neckers
must die!


are there specific ones for each make/model?
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