You're lucky to have a year that you can get the
failure code manually and clear it. My '96 needs a monitor to be attached to do this, so I'll be
seeing my Subaru dealer soon. Anyway, do a search
on "check AND engine" and there are a couple of
threads on how to do this. Basically, pull off the
foot panel cover (where the inner fuse box is) and find 2 loose wires (contact pins), and a 1" square plug with about 8 contacts and a notch. You put a pin in the right plug location and then turn the ignition key on, and count long/short blinks of the CE light to get the code. It dumps any codes stored or if only one, you get that repeatedly.
Using both pins in the right location will clear
the codes, then you get a steady blinking.
A couple of the replies have the codes as well
as the procedure, so check any matches you find.
Good luck. If you need help, I'm sure you can get
more here.