Hi, MD802(Basic DS/ Four System) just can test Engine, AT, ABS, SRS only. And MD802(Enhanced DS/ All System) can test all of systems, not just Engine, AT, ABS, SRS. Please compare the function list of 4 system and all system for more details:
http://pro.auteltech.com/measurecar-1-1.html?m=4.
It is true taht MD802 (Basic DS/ Four System) can be upgraded to a Enhanced DS/ All System one by doing software update. As for the price, please consult your dealer. Thanks!