daiboy

please can any one help me im at my wits ends i have a 2001 C5 . 2.0 HDI . the engine light come on and it cut out after two weeks , it would not drive for more then 500 yards befor all the light on the dash coming on , any way had it towd to a grage where it cost me £280 for a fule presure reg .picked it up a 100 miles later the light come on yet again this time same grage told me it was the air flow sensor needs replacing done that 2 miles down the road the lights on again went back to the grage they put the car on the machine out the light went ok for a mile now back on sorry if im going on but i need help .i did notice when i took the key out the engine would run on for a sec or two with the key in my hand pleaase help me sorry if this if in the wrong part but im new and not sure how to use the site yet yours Dai