Its only on the poverty spec engines too, its not on all the Tdis.
On the powerful (170/190 bhp) 2.0s they have Urea additives which drop the particulate count, to save money they didn't include them on the 130/140 models and gave a larger fuel tank instead.
Unfortunately, most of the 2.0s sold are the lower range engines as they are the favourites of Lease/Company cars and people who buy a diesel to avoid tax.
All manufacturers will have gamed the test, same with the MPG test, you know the criteria, you program around it to sell cars. The issue with VAG, is they then thought they don't need the expensive tech on a basic car and thats whats cost them. Its why BMWs aren't affected, they all have urea / adblue additive systems.
Luckily Volkswagen AG can rely on the general population being stupid and saying "Volkswagen cheated the system, so I'm going to buy a Skoda/Seat/Audi next time round!".
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