The vehicles pass the EU emissions test as it tests for Co2 and not Carbon Oxide, so what are you going to fine them for? They're going to fit Adblue tanks to existing vehicles including EU ones, to comply with the US test for Carbon Oxide emissions.
Now how about a fine for those manufacturers producing hybrid vehicles because of the damage to health and the environment by the open cast mining methods and both the production and destruction of the batteries? Your hybrid may run partially cleaner than a diesel but getting it on the road is more destructive.
The pollution from cars is a drop in the ocean compared to industry.
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The tests that were rigged were not for Co2 emissions they were for NOX, mainly Nitrogen Dioxide which is the main pollutant from diesel engines. Diesels emit lower amounts of carbon monoxide, hydrocarbons and carbon dioxide than petrol so whilst the Co2 figures will be higher in real life that is also true of every vehicle on the road and will be until they stop testing in lab conditions.. Not really sure what you are referring to when you say Carbon Oxide.