Q5; w/Diesel. A single complete drive axle assembly, used on vehicles that utilize dependent suspension systems, that includes a differential and drive axles to deliver power to the wheels of a vehicle in order to drive the vehicle. Device connecting Drive Shaft to Axle Shafts that allows for varied speeds of wheel rotation. Differential Code NPR. Exc.Active Differential. From 12/12/2011. To 12/12/2011.