Can I chose another answer?

That's what I was afraid of. That the Snap-On and other professional tools have a catalogue of codes that is not accessible to the public.

Cause right now that OBD-II codereader is not very useful. It tells me that me catalyser is finished, no surprise on a 2002 Buick Rendezvous with over 200K km. It wouldn't even report a generic code for the ABS while the light came on in the dash.

That's where the Snap-On tool shined, it had info on each individual wheel sensor.