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The paper deals with methodology for selection of Emission Control Devices (ECD), test matrix and evaluation procedure followed for vehicles, engines and analysis of test results. In the present scenario, it is always being discussed that how existing vehicles and engines manufactured in India complying to Euro I /Euro II standard will perform with different sulphur percentage fuel. The emission control device such as Oxidation Catalytic Converter (OCC) is not very commonly used on the Euro-II vehicle and heavy-duty commercial vehicles. The performance of diesel oxidation catalyst on different sulphur percentage is of vital importance in Indian scenario. The particulate matter is always a concern in diesel vehicles and engines and most of Indian vehicles are having very low margin for particulate matter vis-à-vis regulation.