Volkswagen used software to CHEAT on AIR POLLUTION tests, alleges US gov
Found on The Register on Saturday, 19 September 2015
A sophisticated software algorithm on certain Volkswagen vehicles detects when the car is undergoing official emissions testing, and turns full emissions controls on only during the test.
This results in cars that meet emissions standards in the laboratory or testing station, but during normal operation, emit nitrogen oxides, or NOx, at up to 40 times the standard.
If that can be proven then all tests need to be redesigned. It's not much of a secret that other values, like fuel consumption, differ from real world values too.