This VW / Audi tool kit T40331 is required for fixing the camshafts in position when removing and installing the camshaft timing chains. 
The special tool is used at the same time on cylinder banks 1 and 2.

Chain Driven Engines
Current Models:
Audi A4 2016 >6-cyl. direct injection engine 3.0L TFSI 4V 
Porsche 2.9L V6 Petrol

Engine: EA 839 Family
2.9L  DCBE / DECA
3.0L CWGD, CZSE, DCDB, DLZA

OEM: T40331 / T90000 / T90001 / T90002