Hi, I own Citroen C5 manufacture year 2005. Suddenly, the car started to: 1) I'm worned that "Fuel tank access not properly locked" 2) The gas gage shows no gas in the tank 3) The "low gas" worning lamp is always turned on 4) The car notifies that one of the dors is open. The car mechanics told us that "The gas computer fails to understand what is happening in the gas tank" and he is not really sure that replacing this compure will fix the problem. I have saw the following link link, which tells that the "theres a magnet sensor in the tank throat......but how do i get the the wires to this sensor.......is it through the wheel arch ???" I need info, TIA - Albert