Method for monitoring the status of an electromechanical actuator which has an electrical drive by means of which a working piston can be moved, wherein - the movement of the working piston changes a closed actuator internal volume V Akt (t), wherein it holds that: V Akt t = V Akt , max − V Zyl t where V Zyl t < V Akt , max , where V Akt,max : maximum actuator internal volume V Zyl (t) : volume V Zyl (t) of the part of the working piston currently projecting into the maximum actuator internal volume V Akt,max and - the actuator internal volume V Akt,max is additionally filled with a gaseous medium having the mass m Gas,0 and a liquid medium having the mass m Flüss,0 , wherein the gaseous medium occupies a current volume V Gas (t) and the liquid medium occupies a current volume V Flüss (t), wherein it holds that: V Akt , max = V Zyl t + V Gas t + V Flüss t comprising the following steps: - determining a pressure P Akt (t) and a temperature T Akt (t) for the actuator internal volume V Akt (t), - based on the pressure P Akt (t) and the temperature T Akt (t) and assuming that there is neither a gas nor a liquid leak in the actuator, estimating the current volume V Flüss (t) of the liquid medium in the actuator internal volume as VG Flüss (t), wherein it holds that VG Flüss (t) = V Akt,max - V Zyl (t) - V Gas (t), - predefining a first condition B1 for the volume VG Flüss (t) and - if the volume VG Flüss (t) does not satisfy condition B1, outputting a warning. - the movement of the working piston changes a closed actuator internal volume V Akt (t), wherein it holds that: V Akt t = V Akt , max − V Zyl t where V Zyl t < V Akt , max , where V Akt,max : maximum actuator internal volume V Zyl (t) : volume V Zyl (t) of the part of the working piston currently projecting into the maximum actuator internal volume V Akt,max and V Akt,max : maximum actuator internal volume V Zyl (t) : volume V Zyl (t) of the part of the working piston currently projecting into the maximum actuator internal volume V Akt,max and - the actuator internal volume V Akt,max is additionally filled with a gaseous medium having the mass m Gas,0 and a liquid medium having the mass m Flüss,0 , wherein the gaseous medium occupies a current volume V Gas (t) and the liquid medium occupies a current volume V Flüss (t), wherein it holds that: V Akt , max = V Zyl t + V Gas t + V Flüss t comprising the following steps: - determining a pressure P Akt (t) and a temperature T Akt (t) for the actuator internal volume V Akt (t), - based on the pressure P Akt (t) and the temperature T Akt (t) and assuming that there is neither a gas nor a liquid leak in the actuator, estimating the current volume V Flüss (t) of the liquid medium in the actuator internal volume as VG Flüss (t), wherein it holds that VG Flüss (t) = V Akt,max - V Zyl (t) - V Gas (t), - predefining a first condition B1 for the volume VG Flüss (t) and - if the volume VG Flüss (t) does not satisfy condition B1, outputting a warning. - determining a pressure P Akt (t) and a temperature T Akt (t) for the actuator internal volume V Akt (t), - based on the pressure P Akt (t) and the temperature T Akt (t) and assuming that there is neither a gas nor a liquid leak in the actuator, estimating the current volume V Flüss (t) of the liquid medium in the actuator internal volume as VG Flüss (t), wherein it holds that VG Flüss (t) = V Akt,max - V Zyl (t) - V Gas (t), - predefining a first condition B1 for the volume VG Flüss (t) and - if the volume VG Flüss (t) does not satisfy condition B1, outputting a warning. <EOS>