Ok, just got back from the dealership. I am posting my results for whoever is interested.
"Reduced engine power message was being displayed. Unable to fault at time of testing. Carried out scan for check engine light came on not at time of testing. Scan car and found fault stored for intake came Vanos. Fault logged only once. Carried out function test on Vanos system. Passed. Erase fault memory as unable to fault car at time of testing."
They said drive it and see.