What does the OBD in a car mean?

1 Answers
Erica
07/29/25 10:48am
OBD in a car stands for On-Board Diagnostics, which is primarily used to monitor the operating status of the engine and the exhaust treatment system in real-time. OBD monitors various systems and components in real-time, including EGR, the engine, particulate filters, catalytic converters, oxygen sensors, emission control systems, fuel systems, and more. Its working principle is as follows: when an emission fault occurs, the ECU records the fault information and related codes, and alerts the driver by illuminating the malfunction indicator lamp (MIL) or check engine warning light. Mechanics can then read the fault codes using the vehicle's original specialized equipment to quickly locate the issue, facilitating vehicle repairs and reducing the time required for manual diagnosis.
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