The Autozones around here use the Actron code reader, which is orange. It'* a good code reader, but can only do so much. Your stability system code is likely a problem with the steering position sensor. The column has to be removed to replace it, and there are something like 3 different options as to which sensor you have. You find out when it'* removed.
Not an easy job.
Are you having traction control issues, also? ABS codes can only be read at the dealer, or with a very expensive scanner. Could very well be a wheel speed sensor on one of the hubs that is causing the problem. It could range from a bad connection, to a bad sensor which requires that the hub be replaced.
The seatbelt warning could be just a loose connection in the seat.
Black 2000 SSEi, Silverstar Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, drilled 180 degree thermostat, Intense FWI, PCM, shift kit, and 3.4 Pulley. Solid front mount.