Time to sell if you've got VAG shares.
Eleven million cars effected in the USA alone allegedly. Considering how litigious the lawyers in the states are, even before we get into the personal stress, public health considerations ETC, we could be looking at eleven million people asking for their money back or looking for a replacement. Even at a conservative ten thousand dollars per car that's £110,000,000,000. Even VW don't have pockets that deep. Add to that all the usual bull shit that goes along with these things and it could bring the company down. There is also a suggestion the the German government were complicit in the deception.
Now wait for the phone calls asking you if you were a victim of the VW miss selling scandal.