What is the OBD in annual vehicle inspection?

[JordanAnn]

Annual inspection OBD refers to the vehicle's exhaust emissions. During the annual inspection, the muffler of the exhaust pipe is also checked. The vehicle inspection mainly examines whether the car's condition meets standards, such as whether the fuel evaporation control system is functioning properly, whether the engine exhibits oil burning during operation. If black smoke is observed, it indicates the vehicle has an oil burning issue. The fuel evaporation control system installed in vehicles primarily prevents fuel leakage from fuel lines into the atmosphere, thereby reducing pollution. It also collects gasoline vapors and redirects them back into the engine for combustion. OBD, or On-Board Diagnostics, is designed to monitor the engine's operational status and continuously check whether the vehicle's exhaust emissions exceed standards. If excessive emissions are detected, the OBD warning light will immediately illuminate.