An advanced tool for the professional tech, yet user-friendly for the DIYer. The 3120 code reader is a great choice for anyone looking to diagnose Check Engine and ABS problems on OBD2 vehicles. Additionally, the 3120 retrieves OEM-enhanced trouble codes and performs KOEO, KOER, Timing Check, Cylinder Balance, Output State, and Wiggle Tests on popular OBD1 vehicles from 1982 to 1995.