TDI and TSI
The way they make diesel engines run fewer NOx emissions is to make it run hotter and on an oil burner, that means pumping in more fuel. On a petrol, you do the opposite, you lean the mixture off. So the upshot of this is the VW group diesels were found to be more economical in the real world than the figures given in the EPA tests. That set some inquisitive minds going and their tests found what we now know as test cheat mode.
So, you bought a VAG group vehicle based on (a) its fuel consumption, (b) its performance and (c) its perceived reliability. Now you're waiting for that recall to get it remapped so it will have poorer fuel consumption, reduced performance, and potentially less reliability. You're going to rip that letter up and give them the bird aren't you?
I know I would.
I'd never go out to buy a car based on its emissions, I buy a car because it does everything I want. If it happened to be the cleanest thing on the planet, I don't care, that wasn't the reason I bought it.
I do wonder how long it will be before other manufacturers are reported as non compliant.
I bet the bods at the EPA will be looking at how they can make their test more "real world" to stop this from happening again.