desertsubaru Posted July 8, 2015 Share Posted July 8, 2015 Is there any way to change the upstream o2 on a 2003 fozi without dropping the exhaust from the engine? Quote Link to comment Share on other sites More sharing options...
GorgeSuby Posted December 7, 2020 Share Posted December 7, 2020 Just hate an unanswered topic even if it is 5yrs old... Found this thread when I was doing mine last weekend & dropping the exhaust did not look fun so decided to find out for myself. On my 03 Forester EJ25 you can get to the upstream & downstream pretty easily through the passenger side wheel well. Take the wheel off obviously & its pretty manageable reach. I bought a 12pt 22mm box wrench & cut a slot in it for the wire, you can use 7/8 as well but the 12pt is nice for the tight space & limited throw. Just an FYI for anyone else who was searching.... 1 1 Quote Link to comment Share on other sites More sharing options...
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