These sites discuss free OBDII software and $65 interface cards for reading codes. The software runs on your laptop, the interface box and cable are described on their 'order' page (one card is listed as 'for imports'. They have an address and forum for tech questions and support issues. Other than , I don't know anything about them. If you are on a budget, you might check them out.
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E