Once you have the necessary portable emissions testing equipment, how much work is it to test a vehicle?
I've been wondering why the researchers at WVU who found the VW cheating have not gone on to test a larger set of vehicles to see who else is cheating.
Do we know the researchers haven't tested other vehicles? If VW were cheating to a greater degree than other manufacturers, that might explain why they were the first to be caught.
Yes, they weren't doing this on their own initiative, they had a contract to test 4 specific vehicles of which 3 were VW TDIs, I think. They didn't initially think they'd found cheating, and it took a year or two for CARB to get interested and things to develop.
I've been wondering why the researchers at WVU who found the VW cheating have not gone on to test a larger set of vehicles to see who else is cheating.