I am driving cross country as we speak and as I was going through ohio my "check engine" light came on. I stopped checked all the obvious...oil, gas cap, brake fluid level, rad fluid etc... all was good! I am suspecting the O2 sensor? The light is on steady, I even disconnected the battery to reset the computer and see if that would work and no go! How many O2 sensors on the 2002 forester non turbo? I am thinking of changing them here in the hotel parking lot any help would be appreciated right now! No dealer around for at least 80 miles!