The invention relates to an
internal combustion engine with a
combustion air intake
system in which a compressor is arranged and in which a
throttle element is arranged downstream of the compressor inthe flow direction of the
combustion air. The
internal combustion engine also comprises a tank ventilation
system and a
crankcase ventilation
system. The tank ventilation system can be connected to the intake system downstream of the
throttle element via a first non-return valve in a first line and upstream of the compressor via a second non-return valve in a second line and a third non-return valve in a second sub-line. The
crankcase ventilation system can be connected to the intake system downstream of the
throttle element via a fourth non-return valve in a third line and upstream of the compressor via a fourth line and the third non-return valve. The intake system can be connected to the second line downstream of the throttle element at a transitional point between the second line andthe second sub-line via a fifth non-return valve in a fifth line. A
nozzle is formed at the transitional point from the fifth line to the second line and the second sub-line, and the second line opensinto the
nozzle downstream of the second non-return valve. A first
pressure sensor for measuring the pressure in the second line is provided in the second line between the second non-return valve andthe
nozzle. By means of the
internal combustion engine design according to the invention with a
crankcase and a tank ventilation system and by means of the corresponding methods, only a single
pressure sensor is required to diagnose or detect a leak. A second
pressure sensor can be advantageously used to locate a leak.