A new two-litre 170PS diesel engine now on offer for A3 and A4 models is the first in the Audi range to combine 'pumpe-duse' or 'pump jet' direct diesel injection with the performance-maximising piezo crystal injector technology from the 2.7-litre V6, 3.0-litre V6 and 4.2-litre V8 TDI engines.