Alternatively you can get an OBD 2 reader and just reset the code yourself and to make sure it is the EGT.
Furthermore the OBD reader will allow full diagnosis so you can see any other faults looming. Subaru normally charge in excess of £55 to reset the CEL once, these are available now for £75 inc P&P [] With the right software it also allows dyno runs and quarter / half mile measurements etc. Of course once purchased you are not limited to Subarus, they will work on any European cars after 2001.
Good pieces of kit.