What is the reason for the OBD not connecting during vehicle inspection?

[SanTyler]

The reason for the OBD not connecting during vehicle inspection is that the vehicle's OBD interface may contain dust, which needs to be cleaned before reconnecting. Contents of regular annual inspection: Check whether the engine, chassis, body, and their ancillary equipment are clean, complete, and effective; whether the paint surface is uniform and aesthetically pleasing; whether the main assemblies have been replaced and match the initial inspection records; and verify whether the vehicle's braking performance, steering control, lighting, exhaust, and other safety performance meet the requirements of the "Technical Conditions for Safe Operation of Motor Vehicles". Conditions for regular annual vehicle inspection: Vehicles whose condition does not match the records on the driving license or archives; vehicles with damaged, incomplete, or illegible license plates or driving licenses, or those with self-made license plates; vehicles that have been modified, remodeled, or undergone technical transformations without completing the necessary approval and modification procedures.