And there was a solution available. AdBlue. Mercedes already used it, and so did BMW. But VW didn't want to use it.
And because of this scandal VW pulled their diesels, AND both Mercedes and BMW followed suit.
Quite sad, because an X5 diesel had really good mileage (if you used it for longer distances).
My diesel VW had adblue, and still was affected by deiselgate. The ecu fix took my highway mpg from 35-50 to 18-24, and made the APR tunes incompatible.