Latest info on this matter -
BMW X3 20d has been caught emitting almost 12 times the EURO 6 Nox limit by an independent company. Therefore, increasingly likely that other manufacturers are rigging the emission tests.
The VW engines affected mainly include the 1.6TDI, the 2.0TDI and the 3.0TDI. These are used in SEAT, VW, Skoda, Audi and Porsche.
The UK Government has called for re-testing of all DIESEL cars according to the Daily Mail. This could subsequently lead to higher VED charges if the car is emitting more than it should be.