The purpose of the crankcase ventilation is to convey the blow-by gases into the engine's intake system. There, they are mixed with fresh air and enter the combustion chamber for combustion.
The crankcase ventilation is switched on by the activation of a valve.
In the event of faults, check the valve, feed hose, signal cables and fuse.
If fault 2FDA is entered, the cause can be a damaged or disconnected air supply line. (This cable is located directly on the engine block and it connects the intake bridge with the engine section on the opposite side). This air supply line is to be checked for leak-tightness if any fault occurs!
The crankcase ventilation valve is only fitted in the US version. The air supply line, on the other hand, is always a part of the engine independently of this.