The speed sensor is the small star looking wheel on the end of the drive axle on the left side below the secondary clutch.
I'm thinking about this for a bit, but wondering if revving it without the belt on past a certain rpm might make the sled think it should be moving, therefore spits out a code because its not reading anything for mph? Not really sure about this one.. I know in some newer cars if you rev them enough in neutral (or clutch pushed in while in gear on a manual) the speedometer will go up just a bit, and the ABS light will go off. It might just get p!$$ed off because it revved beyond a speific rpm?
The TORS may have activated if the motor was free-spinning and the throttle blades were held oped for a split second when you let off by the volume of air entering the motor. There's an issue with that on the boosted forums from time to time.
My guess is to just put the belt back on, maybe disconnect the battery cable for a bit and try that?
I'll try to read up here and see if I can find anything.