[rick3000]

I don't have a comment on the battery drain, Pdwight's suggestion is probably the most likely scenario. I thought the double beep was tied to the doors, trunks, and console, but I wouldn't be surprised if it was also linked to the stereo anti-theft.

However, I can answer your last question, a cheap HF OBD reader will read generic codes and let you reset non-safety codes (aka - not the airbag light). I used one for several years before buying a Durametric. I still keep it in my 986 so I can check codes if I ever get a random CEL.