how can i fix my vauxhall vectra c 2.2dti 2002 model?

HI I HAVE A VECTRA C 2.2 DTI WHICH A LIGHT OF A CAR WITH A SPANNER COMES ON ,IN THE FAULT DISPLAY ON THE DASH IT COMES ON WHEN DRIVING. WHEN I TURN OFF THE IGNITION THE LIGHT GOES OUT AND THEN COMES BACK ON AGAIN A FEW MILES LATER. THE CAR IS A UK REGISTERED CAR BUT I LIVE IN SPAIN AND IM HAVING PROBLEMS WITH GARAGES WANTING 150 EUROS JUST TO PLUG THE DIAGNOSTIC SCANNER IN AND THEN TO BE TOLD NO CODES ARE LISTED BECAUSE THEY SAY OPEL AND VAUXHALL ARE DIFFERENT SOFTWARE PLEASE HELP ME IM GOING MAD THANKS GAVIN