[dcormier]

VW's detected emissions testing when the steering wheel was never turned.

[spacecadet]

Makes sense. As I said, emission testing is often not performed when the vehicle is being driven/under load. States could incorporate dyno testing, but its technical, complicated, and unsafe.

[Fatnino]

Is that what it was?

I though it was when the car is on a dyno only the drive wheels turn while the other 2 are stationary.

[spacecadet]

You are correct, the steering wheel approach is very smart... all I was suggesting was that dyno testing would limit the ability to defeat, but testing stations would also need to simulate more of the vehicles systems.