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What does the car OBD interface mean?

1 Answers

DeCharles

07/29/25 4:22pm

Car OBD interface is the on-board automatic diagnostic system, which monitors the engine's operating conditions to check whether the vehicle's exhaust emissions exceed the standard. Once the standard is exceeded, it will immediately issue a warning. When the system fails, the fault lamp or check engine warning light will turn on, and the powertrain control module will store the fault information in the memory. The fault code can be read from the PCM through a certain program. The working principle of the OBD interface: OBD monitors the engine, catalytic converter, particulate trap, oxygen sensor, emission control system, fuel system, EGR and other systems and components in real time, and then connects the information of different emission-related components to the ECU.

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