For early Isuzu the Pro-link, for 98 and up(4HE1, 5.7, and 6HK) the Tech 2, for'05(4hk1 +new 6HK1) and up IDSS(Isuzu Diagnostic Service System) you can use the Tech 2 as well, but codes and data aren't neccesarily correct, and Isuzu prefers that you use the ID... Login to read more.