Method And Device For Diagnosing A Leakage Of A Crankcase Ventilation Line Of A Crankcase Ventilation Device For An Internal Combustion Engine

The disclosure relates to a method for leakage diagnosis. The method includes influencing the introduction of gas along a crankcase aeration line into a crankcase of an internal combustion engine and acquiring a measurement signal profile by an exhaust-gas sensor arranged in an exhaust-gas tract of an internal combustion engine. The measurement signal profile is characteristic of at least one exhaust-gas property of the exhaust gas. The method includes providing an expected measurement signal profile which is characteristic of the exhaust-gas property of the exhaust gas in the exhaust-gas tract based on the influence on the introduction of gas into the crankcase. Additionally, the method includes comparing the acquired measurement signal profile with the expected measurement signal profile and identifying that the crankcase ventilation line has a leak if, during the comparison, the acquired measurement signal profile deviates from the expected measurement signal profile by a predetermined threshold value.