gman5250
Charter Member
This is a software issue. You'll probably get a notice to go to the dealer for a new rom chip, or a re-programming. If you don't take the car in, it won't get fixed, and then you'll still get the great MPG... The 'fix' may actually cause more net pollution than leaving it alone. Less MPG means more trips to the pump, burning more fuel, which causes more net pollution.
Dick
At first this looks like the case, but then I read this article.
https://www.washingtonpost.com/news/the-switch/wp/2015/09/22/the-tech-behind-how-volkswagen-tricked-emissions-tests/
The fact that the software anticipates certain tests raises the question of what happens after the cheater software is neutered. The variance in performance and emissions is dramatic when the cheater is disabled.
How will the engine(s) respond when actually being required to meet the various requirements without the cheater. I'd wager that they are not going to be able to pull it off without major mechanical mods like replacing EFI injectors or solenoids which can translate into big problems with exhaust/cat converters.
Bear in mind that these engines were very likely designed entirely around the cheat. I see big problems.
I wonder how the newly chipped vehicles would read out on a real world dyno.

Interesting stuff to ponder...and watch as things develop.