Seems like it is a fault thrown up by something in the fuel tank evap system. I know that on a D2 the fuel cap being loose will cause a problem, but generally we don't get the engine management light the same as NAS spec cars.
Have a look around all of the fuel tank venting, charcoal filter (if fitted) and so on.
There is a section in RAVE starting at P195 and going to P196 giving details and diagnostics info. This is for the D1, not D2.
Peter