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Old 01-03-2010, 08:44 PM   #1
tlknv
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How to replace upstream O2 sensor

I need to replace upstream O2 sensor on my Subaru Forester L 1999. Do I need to remove the shield under the catalitic converter or it's possible to unscrew the sersor with some kind of "socket" wrench ? All the bolts which hold the shield are very rusty and I'm not sure if it's possible to unscrew them.
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Old 01-03-2010, 09:10 PM   #2
danielsatur
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Re: How to replace upstream O2 sensor

The upstream H02 sensor is the sensor closer to the exhaust manifold, it's the size of a spark plug, and canbe taken out with a wrench.
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Old 01-03-2010, 09:28 PM   #3
tlknv
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Re: How to replace upstream O2 sensor

Danielsatur,
Thank you for the answer. I just want to make sure that it should be some special/socket wrench. Shouldn't it ? It's impossible to unscrew upstream O2 sensor with any regular wrench.
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Old 01-03-2010, 09:38 PM   #4
danielsatur
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Re: How to replace upstream O2 sensor

Disconnect H02 sensor, thread a good boxed end wrench, and turn counter clockwise to remove.

Don't forget to put anti sezie compound on the threads of new sensor.
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Old 01-03-2010, 09:58 PM   #5
tlknv
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Re: How to replace upstream O2 sensor

Thank you, Danielsatur.
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Old 01-04-2010, 09:47 PM   #6
tlknv
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Re: How to replace upstream O2 sensor

Danielsatur,
Thanks for the info.
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Old 01-04-2010, 09:51 PM   #7
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Re: How to replace upstream O2 sensor

Dear moderator,
It's my third attempt to just say thanks to the author of the answers.
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Old 03-26-2010, 07:53 PM   #8
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Re: How to replace upstream O2 sensor

if too rusty try using aero-kroil or pb blaster let sit a little while
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