Glow Plug without Combustion Chamber Pressure Sensor
WARNING: This page is about a different car, the 2016 Audi A7 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
1 - Glow plug with combustion chamber pressure sensor (installed only in cylinder 2)
2 - Glow Plug without Combustion Chamber Pressure Sensor
NOTE:
Depending on the emissions standard on the cylinder 2 a combustion chamber pressure sensor is integrated in the "glow plug" component.
Component designation: Glow Plug 2 -Q11- with Cylinder 2 Combustion Chamber Pressure Sensor -G678-