I'm pretty sure that FI only indicates that there is a problem and is not an error code itself. You will have to either take it to a dealer that has the diagnostic scanner tool or try and get the code yourself. The scanner tool itself is expensive and not readily available to the public.
Another way to try and get the code is to push the set and mode button together when the FI goes off and count the flashes. For example: "flash-flash pause flash-flash-flash" would be error code 23.
It could be a bad sensor, bad ECU, or problem with the turbo, but no way to know for sure until you hook it up to the scanner or get the code.