What does the OBD inspection in vehicle annual inspection mean?
1 Answers
Vehicle annual inspection OBD inspection refers to the On-Board Diagnostics system, which continuously monitors the engine's operating conditions to check if the vehicle's emissions exceed standards. If they do, the system will immediately issue a warning. When a fault occurs in the system, the malfunction indicator lamp or check engine warning light will illuminate, and the Powertrain Control Module (PCM) will store the fault information in memory. Through specific procedures, the fault code can be read from the PCM. Based on the fault code, maintenance personnel can quickly and accurately determine the nature of the fault. If the OBD light is on, it indicates poor combustion conditions in the vehicle, leading to excessive emissions. When the OBD light is on, the vehicle needs to be inspected and repaired at a 4S shop, as general car owners cannot diagnose the cause of the fault themselves.