The goal of this course is to familiarize you with the history of vehicle emissions systems and the evolution of OBD, help you understand how input sensors and output components function, and help you understand how OBD II requires standardization. In this course you will learn the differences between OBD inputs and outputs, compare the differences between OBD and OBD II systems, retrieve scan data from OBD systems, and diagnose and repair primary sensors and output components.