On-Board Diagnostic (OBD) is a term used to describe a computerized system that monitors the vehicle’s emission controls. This system includes self-diagnostic and reporting functions. Most 1996 and newer vehicles less than 14,000 pounds gross vehicle weight rating (GVWR) (e.g., passenger cars, pickup trucks, sport utility vehicles) are equipped with second-generation OBD systems also known as OBD II.
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