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This paper describes a methodology for design and development of On-Board Diagnostic system (OBD) with an objective to improve current reliability process in order to ensure design & quality of the new system as per requirement of commercial vehicle technology. OBD is a system that detects failures which adversely affect emissions and illuminates a MIL (Malfunction Indicator Lamp) to inform the driver of a fault which may lead to increase in emissions. OBD provides standard and unrestricted access for diagnosis and repair. Below given Figure 1 shows the working principle of OBD system. The exhaust emission of a vehicle will be controlled primarily by Engine Control Unit (ECU) and Exhaust Gas After Treatment Control (EGAS CU). These two control units determine the combined operating strategies of the engine and after treatment device. Figure 1 Modern Control Architecture for OBD System in Commercial vehicle [1]

Indian Bharat Stage (BS) vehicular emission norms were introduced in the year 2000 which was two emission stages behind Europe. During last decade India has progressed faster compared to Europe and have implemented BS-IV emission norms in 2010 which is one stage behind Europe. This paper reviews progress of Indian vehicular emissions, and On-Board Diagnostic (OBD) legislations. Further, it also explores the technology advancements in engine emission control devices and Fuel quality happened due to tightening of emission norms.