What does OBD mean in car inspection?

[VonArcher]

Car inspection OBD check refers to the On-Board Diagnostics system. Here are the relevant introductions: 1. The OBD system continuously monitors the engine's operating conditions to check if the vehicle's exhaust exceeds standards, and will issue an immediate warning if it does. 2. When a fault occurs in this system, the malfunction indicator light or check engine warning light will illuminate, while the powertrain control module stores the fault information in memory. The fault code can be read from the PCM through specific procedures, allowing maintenance personnel to quickly and accurately determine the nature of the fault based on the fault code's indication. 3. An illuminated OBD light indicates poor combustion conditions in the car, leading to excessive exhaust emissions. When the OBD light is on, it needs to be inspected and repaired at a 4S shop, as general car owners cannot independently diagnose and resolve the cause of the fault.