I lost Power steering on Q7 2012 mod. in a right turn.
I felt some vibrations (2-3 times) and then the car is hard to turn.
Oil reservoar OK. ( At lower part of gagepin. )
Diagnose test gives:
4F Electronic Central Electric System 2
01797:009
Power steering hydraulic. pressure valve - Open circuit/short circuit to ground.
Passive/Sporadic

Any suggestions ?
Thank you.