Skoda Octavia electric powersteering failure

car was bought as none runner.previous to me buying the car it would not start and went to a garage for repair.while looking for the problem the garage stripped all the dash and centre console and still could not find problem.since buying the car i have rebuilt all the inside and replaced ecu and now the car runs but unfortunately the power steering no longer works and air bag light wont go out either. thanks for looking and hope to here from some one soon who can help me.