The C503 is a multi-function diagnostic instrument designed for VW models that will enable you to read and clear all of Classes' diagnostic faults in the Vw.Such as 01-Engine control module 1,02-Transmission control module,15-Airbag,17-Dash board,08-Air conditioning.We also have OBDII features that allow you to scan all engine readings and associated fault codes on any later vehicle manufacturers.