July 8, 201510 yr Is there any way to change the upstream o2 on a 2003 fozi without dropping the exhaust from the engine?
December 7, 20205 yr 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....
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