Well, not that this will be any help, but welcome to my world. My '95 GL has been doing the CE light thing for over 2 years now. After dropping too much money into diagnostics (in Texas and Cali') the mechanics don't know what is going on. Even after having my engine rebuilt/retrofitted last year, the same thing. Tried resetting the 'puter... didn't work.
At first thought it was my chip causing a faulty read. But tests come up empty. haven't experienced any probs with the brake light (yet) and she has over 124,000 on the odometer. Sorry I couldn't help.
James