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Old 05-23-2005, 12:29 PM   #1
Kensubguy
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Default Oxygen sensor

I aim to change the Oxygen sensor in my 99 subaru legacy. Is this a hard job and can someone guided me arround to it. If it is doable I aim to get to it this comming weekend
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Old 05-23-2005, 01:07 PM   #2
xcntrk75
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Front or rear?

If it’s the stock original and has been there a while, I would crawl under there a couple days prior and spray the bung down with liquid-wrench or other type of loosener product. Spray it down one day, drive around, spray it down the next day, drive around, and then change it out. Stripping the bung can commonly occur especially with an old rust-welded sensor.

When replacing, you may want to apply a thin layer of anti-seize in case it every needs to come back out again in the future (i.e. exhaust upgrades).

Good luck
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Old 05-23-2005, 04:22 PM   #3
Kensubguy
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Originally Posted by xcntrk75
Front or rear?

If it’s the stock original and has been there a while, I would crawl under there a couple days prior and spray the bung down with liquid-wrench or other type of loosener product. Spray it down one day, drive around, spray it down the next day, drive around, and then change it out. Stripping the bung can commonly occur especially with an old rust-welded sensor.

When replacing, you may want to apply a thin layer of anti-seize in case it every needs to come back out again in the future (i.e. exhaust upgrades).

Good luck
I want to chnge both. Where exactly are they located and is it one of those jobs like changing plugs and wires. I have no clue where to find it but from your reply I figure it is on the underside of engine.
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Old 05-23-2005, 04:51 PM   #4
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They are both located in the cat on the exhaust system. They are screwed into bungs. Access can be tough sometimes and you want to be careful not to strip the "nut" part of the sensor using a crescent. Either a socket made for o2 sensors or a large open end wrench.

Jared
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Old 05-23-2005, 05:09 PM   #5
Kensubguy
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Quote:
Originally Posted by gtwagon941
They are both located in the cat on the exhaust system. They are screwed into bungs. Access can be tough sometimes and you want to be careful not to strip the "nut" part of the sensor using a crescent. Either a socket made for o2 sensors or a large open end wrench.

Jared
I see that there is BOSCH O.E. TYPE and BOSCH UNIVERSAL the universal is cheaper. Is there any diffrence? should I buy one over the other.
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Old 05-23-2005, 05:44 PM   #6
xcntrk75
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Why don’t you just buy a factory replacement part? You can probably get them in stock from a dealer or save your self some pennies and buy online but wait 1+ week for shipping…

http://www.1stsubaruparts.com/
http://www.subaruparts.com
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Old 05-23-2005, 10:39 PM   #7
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I just want to reierate how important it is not to force the old ones out. If you strip the threads in the bung you are s.o.l and will have to find a good machine shop. Be careful. Also, if you are a do-it-yourselfer like me, invest in a chiltons manual. It pays for itself every time you fix something yourself.
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Old 05-23-2005, 11:04 PM   #8
mattyg41383
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Definately spray it several times before attempting to remove. Ive even heard of them breaking on the way out, and thats a whole new can of worms. But it shouldnt be that difficult if its not rusted on.
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Old 05-23-2005, 11:38 PM   #9
KD7000
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Quote:
Originally Posted by Kensubguy
I see that there is BOSCH O.E. TYPE and BOSCH UNIVERSAL the universal is cheaper. Is there any diffrence? should I buy one over the other.
The OE type will have the proper connector, all ready to plug right in.

The universal ones come with bare wires & sometimes an assortment of connector options. You'll probably need to re-use your old connectors, which will involve soldering and heatshrinking if you want to do it right. (wire nuts/ crimps/etc. are crappy & unreliable).

Just buy an OE set, or order the pair from a dealer / parts place. Keep in mind the front and rear sensors have two different part numbers, and they have different connectors. (at least that's how it is was on my old '97)

-Brian
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Old 05-24-2005, 07:56 AM   #10
Perdue
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definately buy the OE type or go order one from subaru. The white and "gray" wires looked the exact same to me on the universal sensor and it made wiring a PITA...I wired the white and gray backwards and had to go back and redo everything, so as usual, something simple took twice as long as it should have.
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Old 05-24-2005, 09:11 AM   #11
Kensubguy
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Quote:
Originally Posted by kpalena
I just want to reierate how important it is not to force the old ones out. If you strip the threads in the bung you are s.o.l and will have to find a good machine shop. Be careful. Also, if you are a do-it-yourselfer like me, invest in a chiltons manual. It pays for itself every time you fix something yourself.
I am nervous about it all over a sudden. I hope all goes well with this but I am worried. I will work on it though and thanks all for joinning me on this project. I ought report back on this project to all here. Again thanks
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