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02 sensor compatibility question.

darsdoug
in 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX

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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.

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

  • Author

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.

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