woodlb

I'm new to the forum never knew this was around till I started researching a problem with my car.My o2 sensor light has been on for a while never been a problem until dec 20 . when I tried to start my car ,it sounded like it had broken the serpintine belt but it hadn't. After crankink for quite a while it finally started, smoked pretty bad but after driving it all seemed to be back to normal , a few days later I noticed the VSC and the VSCoff lights were on as well as the rear backup light warning , after it warmed up it wouldn't idle . what is the problem ? I have a 1999 Gs300