Onboard Diagnostics II (OBD-II) is a standardized system that onboard computers in cars and trucks use for self-diagnostics and reporting. This system grew out of Californa Air Resources Board (CARB) regulations, and it was implemented with specifications that were developed by the Society of Automotive Engineers (SAE). Unlike earlier, OEM-specific OBD-I systems, OBD-II systems use the same communication protocols, code designations, and connectors from one manufacturer to another. This allows a single OBD-II scanner to provide access to the data that these systems are capable of providing across all makes and models of vehicles produced since 1996, which was the first model year that Professional Diagnostic Tool Was required across the board. Types of OBD-II Scanners There are two basic categories of OBD-II scanners that you’ll come across in the wild. 1.Code readers OBD-II code readers are typically inexpensive, no-frills devices that can read and clear codes fr...