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What is Vehicle OBD?

1 Answers

Brady

07/30/25 4:43am

OBD stands for On-Board Diagnostics, which is an automated system used to monitor the engine's operating status and the working condition of the exhaust treatment system in real-time. The systems and components monitored by OBD in real-time include: EGR, engine, particulate filter, catalytic converter, oxygen sensor, emission control system, fuel system, among others. The working principle of OBD is that when an emission fault occurs, the ECU records the fault information and related codes, and notifies the driver by illuminating the fault light or check engine warning light. Maintenance personnel can quickly locate the fault by reading the fault codes with the vehicle's original factory-specific instrument, facilitating vehicle repairs and reducing the time required for manual diagnosis.

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