Today I went out to my car to move it onto the drive to clean it. When i started it up the power steering light was on so I checked my fluid level and it seemed a little low but nothing too extreme so I have topped it up a bit, took it for a drive to ensure there is no air in it but still having no luck. No noise or anything showing any signs of fault, no leak or anything... has anything experienced anything similar or know where i could start to find the problem? I drive a 2011 Seat Ibiza 2.0tdi