So they inject wee-wee into the exhaust to negate NOx?! That's a new one! I read about this today, naughty VW!
Trucks have been using it for years to heavily reduce the tax. As r1minimagic said, It's turning the 'device' off that's causing all the moaning. I don't see what the big deal is to be honest. It's only avoiding tax, which a lot of companies do, and that's the real problem. All comes down to a money issue, nothing to do with saving the planet.
Countries around the globe have signed up to reduce pollution levels, the introduction of the testing limits (such as euro 3, 4, 5, 6) is to reduce the pollution from vehicles. The vehicles have to meet the regulations. VAG are only meeting the US standards by programming the ecu during tests and afterwards it returns to normal, giving higher levels of pollution. The impact is countries failing to meet pollution reduction. Its not about avoiding tax, its about VAG selling and pushing diesel cars into the US. The US dont buy diesel cars historically, but VAG have been pushing diesel cars hard into the US.
UK cars......VAG haven't reduced the pollution during tests to save you road tax, they've done it to sell cars again and pass stricter tests on new vehicles.
And yes AdBlue and other addative systems have been used on trucks for many years. Trucks typically use alot more of the fluid than cars, but some cars do use this type of system also.
I did fill trucks with the stuff. I understand It's no right to sell cars, advertising low emissions ect, but I really do think It's all about money. The only reason the government got on the wagon in the first place is because they could make lots of money from the idea. Will I see a 2012 Golf advertised for £2.50 next week, when VW go under.