There was some brouhaha that started a couple of years ago whereas remote roadside sensors in some urban & cities were picking up really high emissions especially from vans since a lot of stuff is ordered online & delivered by vans. One Mercedes van model (forget which model) was pulled & tested in real world driving conditions & found to be 18 times over the Euro 6 emission limit.
I think the group action law suits against Mercedes are still ongoing with these cars/van models.
