darsdoug Posted October 14, 2018 Share Posted October 14, 2018 Experiencing poor gas mileage after replacing a downstream oxygen sensor in a 96 Legacy 2.2 with a 2004 Forester 2.5 downstream oxygen sensor. No CEL. Just runs different. I'm convinced it does matter. Link to comment Share on other sites More sharing options...
GeneralDisorder Posted October 14, 2018 Share Posted October 14, 2018 It doesn't. Subaru didn't start doing post cat fuel trim till 2005. That's just a narrow band sensor that is used for cat efficiency monitoring. It has NOTHING to do with fueling calculations. GD Link to comment Share on other sites More sharing options...
darsdoug Posted October 14, 2018 Author Share Posted October 14, 2018 Thank you. I do realize I need to hit the books on the emission stuff more often. Ebay's compatibility chart isn't very precise 100% of the time is it? I ordered up a 96 downstream sensor before I was aware of that. I may as well put that in when it gets here. e-z job. Link to comment Share on other sites More sharing options...
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