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What is the function of OBD?

1 Answers

BrookeLee

07/30/25 9:00am

OBD is the On-Board Diagnostics system. This system continuously monitors the engine's operating conditions to check if the vehicle's emissions exceed the standard. If they do, it will immediately issue a warning. When a system malfunction occurs, the malfunction indicator light or check engine warning light will illuminate, and the Powertrain Control Module (PCM) will store the fault information in memory. Through a specific procedure, the fault code can be read from the PCM. Based on the fault code, maintenance personnel can quickly and accurately determine the nature and location of the fault. The OBD device monitors multiple systems and components, including the engine, catalytic converter, particulate trap, oxygen sensor, emission control system, fuel system, EGR, etc.

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