Logic of naming actuators in VW-group is simple it contains "N" + actuator number. The actuator number is unique. Here you can find fitting location, connectors and some basic information about actuators.
To our mind, actuators information is reference, so there is only simple search by number.
V8 4.2 FSI Front view
-1-Knock sensor 2 -G66 (brown connector) bank 1
-2-Knock sensor 1 -G61 (black connector) bank 1
-4- G336 - Intake manifold flap potentiometer
-6- N316 - Intake manifold flap valve
-7- N156 - Intake manifold changeover valve
-8- G512 - Intake manifold flap potentiometer 2
-10-Knock sensor 3 -G198 (black connector) bank 2
-11-Knock sensor 4 -G199 (brown connector) bank 2
The vacuum-controlled valves -6- and -7- will be
phased-in as from model year 2009.
-V157 will be replaced by -N316, and -V183 by