I used the elm 327 OBDII device with free software EasyOBDII as all other programs who comes with the CD need a serial number to be used.
long time before I could make an update, with the error you can see on the picture, I changed the mass air flow sensor, the check engine light dissapeared for one day only ! gr.. gr...
the 2 code errors are
P0501 Vehicle Speed Sensor Range/performance
P0100 Mass or Volume Air Flow Circuit Malfunction
if anybody can help