Also changed out the downstream O2 sensor earlier today, runs a lot better now, no sputtering! The old sensor was carboned up/black soot. New one does not have an opening that I can see.
Hello from Northern Cal. I was given two Subarus & each came with free car problems, so the inner-web led me here. One is a ‘99 Outback & the other an ‘02 Forester. So far, I’ve been impressed with how easy they are to work on as well as how capable they are off road.
Cheers