Method for determining an injection volume difference in a combustion engine having a plurality of cylinders, wherein the injection volume difference comprises a difference between a first injection volume into a first cylinder of the plurality of cylinders and a second injection volume into a second cylinder of the plurality of cylinders, wherein the combustion engine comprises a pressure pipe for feeding fuel to injection valves of at least the first and second cylinders, wherein the method comprises: - for at least the first cylinder and the second cylinder, in each case: - detecting a plurality of chronologically successive first pressure values in the pressure pipe before a fuel injection into the cylinder, - detecting a plurality of chronologically successive second pressure values in the pressure pipe after the fuel injection into the cylinder, - determining a histogram which represents a frequency distribution of the plurality of first and the plurality of second pressure values (23, 24) and - determining whether the frequency distribution corresponds essentially to a normal distribution or not, and - determining a pressure difference value for the cylinder on the basis of the plurality of first pressure values and the plurality of second pressure values, if the plurality of first pressure values and the plurality of second pressure values correspond at least essentially to a normal distribution, and - determining the injection volume difference as a function of the pressure difference value of the first cylinder and the pressure difference value of the second cylinder. - for at least the first cylinder and the second cylinder, in each case: - detecting a plurality of chronologically successive first pressure values in the pressure pipe before a fuel injection into the cylinder, - detecting a plurality of chronologically successive second pressure values in the pressure pipe after the fuel injection into the cylinder, - determining a histogram which represents a frequency distribution of the plurality of first and the plurality of second pressure values (23, 24) and - determining whether the frequency distribution corresponds essentially to a normal distribution or not, and - determining a pressure difference value for the cylinder on the basis of the plurality of first pressure values and the plurality of second pressure values, if the plurality of first pressure values and the plurality of second pressure values correspond at least essentially to a normal distribution, and - determining the injection volume difference as a function of the pressure difference value of the first cylinder and the pressure difference value of the second cylinder. - detecting a plurality of chronologically successive first pressure values in the pressure pipe before a fuel injection into the cylinder, - detecting a plurality of chronologically successive second pressure values in the pressure pipe after the fuel injection into the cylinder, - determining a histogram which represents a frequency distribution of the plurality of first and the plurality of second pressure values (23, 24) and - determining whether the frequency distribution corresponds essentially to a normal distribution or not, and - determining a pressure difference value for the cylinder on the basis of the plurality of first pressure values and the plurality of second pressure values, if the plurality of first pressure values and the plurality of second pressure values correspond at least essentially to a normal distribution, and - determining the injection volume difference as a function of the pressure difference value of the first cylinder and the pressure difference value of the second cylinder.