What does OBD mean in cars?

[KingstonMarie]

On-Board Diagnostics (OBD) refers to a vehicle's onboard self-diagnostic system. This system monitors the engine's operating conditions to continuously check whether the vehicle's emissions exceed standards. If emissions exceed limits, it will immediately issue a warning. OBD interface location: The position varies by vehicle model. For most models from brands like GM, Volkswagen, Ford, and Citroën, the OBD interface is located at the lower left corner of the steering wheel. For imported Lexus models, the OBD interface is positioned at the lower right corner of the steering wheel. How automotive OBD works: When a fault occurs in any vehicle system, the malfunction indicator lamp or check engine warning light will illuminate. Simultaneously, the Powertrain Control Module (PCM) quickly stores the fault information in memory. Through specific procedures, fault codes can be retrieved from the PCM. Based on these fault codes, automotive technicians can accurately identify the nature and location of vehicle faults, enabling more efficient repairs and ensuring vehicle safety and driving security.