Question about 2005 Subaru Legacy

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2005 Subaru Legacy: Where are the O2 sensors located (both)

Trying to locate both the up- and downstream O2 sensors under our 2 2005 Subaru Legacy's, one GT, one not. (not Outback's).
Any help??

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  • 7 more comments 
  • 5-speeddrive Nov 22, 2008

    Well, that much I know, but thanks anyway. Was changing the oil today and found the pre-cat one hiding near the filter behind the panel...

  • Anonymous Mar 13, 2014

    1997 subaru legacy outback relay switch for turn signals

  • Anonymous Mar 16, 2014

    where is the location of downstream 02 sensor connector? is it under the passanger side seat?

  • Anonymous Mar 17, 2014


  • Anonymous Mar 22, 2014

    its a 2.5i standard no turbo or anything. My local subaru service center says its a screw on filter located on the side of the transmission. Is there a picture diagram of where this is located exactly

  • Anonymous Mar 25, 2014

    Pulled a p0340 code today on my 2005 subaru legacy gt Where exactly are my cam shaft sensors located at?

  • Anonymous Mar 26, 2014


  • Anonymous Mar 26, 2014

    replacing the air/fuel sensor bank 1 on 2005 subaru legacy

  • Anonymous Mar 28, 2014

    Can not remove the license plate bulbs



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The o2 sensors are locted in the exhaust system. upstream is before cat converter, downstream is after cat converter.

Posted on Nov 22, 2008


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Here you go:

2.5L Engine To Remove:
  1. Disconnect the battery ground cable.
  2. Remove the air cleaner housing.
  3. Vehicles with 5-spd transmission: Remove the clutch slave cylinder and set aside.
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