Plug connector having a contact carrier for receiving plug contacts, - having a plug opening which is designed at the front on the contact carrier in the plug direction X and serves to receive counter contacts, - having a first contact carrier side wall, - having a regular coding lug grid that defines the regular arrangement of coding lugs on the contact carrier, wherein - the first contact carrier side wall is provided with at least one first connecting means, wherein - the outer surface of the first contact carrier side wall is divided into mounting strips (M.1, M.2) arranged transverse to the plug direction, - the mounting strips (M.1, M.2) extend completely over the side wall width, - the first connecting means are arranged in a second, coding lug-free mounting strip (M.2), and - having a second contact carrier side wall which is arranged opposite the first side wall and receives the plug opening between itself and the first side wall, - having at least one second connecting means on the second contact carrier side wall, characterised in that - the coding lugs are arranged on the outer surface of the contact carrier side wall, are projected towards the contact carrier side wall and can be designed in a manner capable of being sheared off, - the coding lugs are arranged in a first mounting strip (M. 1), - the first connecting means is arranged on the contact carrier side wall receiving the coding lug grid, - the coding lug grid extends completely over the side wall width, - there is a geometric mirror plane, which is designed parallel to the contact carrier side wall and is placed between the first and second contact carrier side wall (21, 22), - second coding lugs are arranged on the second contact carrier side wall, - the arrangement of the second coding lugs takes place in a third mounting strip (M.3), which is arranged on the second contact carrier side wall in a mirror-image to the first mounting strip (M. 1), - there is a fourth coding lug-free mounting strip (M.4) on the second contact carrier side wall in which at least one second connecting means is arranged. - having a plug opening which is designed at the front on the contact carrier in the plug direction X and serves to receive counter contacts, - having a first contact carrier side wall, - having a regular coding lug grid that defines the regular arrangement of coding lugs on the contact carrier, wherein - the first contact carrier side wall is provided with at least one first connecting means, wherein - the outer surface of the first contact carrier side wall is divided into mounting strips (M.1, M.2) arranged transverse to the plug direction, - the mounting strips (M.1, M.2) extend completely over the side wall width, - the first connecting means are arranged in a second, coding lug-free mounting strip (M.2), and - having a second contact carrier side wall which is arranged opposite the first side wall and receives the plug opening between itself and the first side wall, - having at least one second connecting means on the second contact carrier side wall, - the coding lugs are arranged on the outer surface of the contact carrier side wall, are projected towards the contact carrier side wall and can be designed in a manner capable of being sheared off, - the coding lugs are arranged in a first mounting strip (M. 1), - the first connecting means is arranged on the contact carrier side wall receiving the coding lug grid, - the coding lug grid extends completely over the side wall width, - there is a geometric mirror plane, which is designed parallel to the contact carrier side wall and is placed between the first and second contact carrier side wall (21, 22), - second coding lugs are arranged on the second contact carrier side wall, - the arrangement of the second coding lugs takes place in a third mounting strip (M.3), which is arranged on the second contact carrier side wall in a mirror-image to the first mounting strip (M. 1), - there is a fourth coding lug-free mounting strip (M.4) on the second contact carrier side wall in which at least one second connecting means is arranged.