> So personally, I would go much further in my suggested response (but I'm not a politician): given the active subversion performed here, I would halt all sales and imports of VW products until they share all source code for their entire (US) range. That should serve as a better deterrent than fines IMHO.

Why not just require that for all cars? It seems a completely sensible policy. Just doing it after a manufacturer has been caught cheating is a reactionary view too.