- probably not as a blanket precondition to allow them to sell cars,
- probably yes during the course of a trial if their cars were measured to have too strong emissions.
Not a lawyer either.
Extrapolating this some more, might we even see a pattern emerging where some kind of clever legal offshoring could allow domestic companies to get a stronger position vs their own governments?
a) they would have been less likely to deliberately subvert the emissions tests in the code or
b) they were more likely to have been found out earlier.