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What are the uses of the car OBD interface?

1 Answers

TessaAnn

07/25/25 12:09am

OBD is the abbreviation of On-Board Diagnostic, which translates to "On-Board Diagnostic System". This system continuously monitors the operating conditions of the engine and the working status of the exhaust after-treatment system. Once it detects a situation that may cause excessive emissions, it will immediately issue a warning. The car's OBD interface mainly has four functions: 1. Display of onboard computer data: The OBD interface can provide various operational data of the vehicle, such as data displayed on the vehicle dashboard, various fuel consumption records, battery voltage, air-fuel ratio, throttle opening, knock count, etc.; 2. Reading fault codes: The OBD interface can be used to read fault codes, which helps in quickly diagnosing vehicle faults and reducing the time for manual diagnosis; 3. Changing codes to achieve more functions: By connecting the data line of the OBD interface to the vehicle's CAN bus and adjusting the codes of various modules, many different "hidden" functions can be achieved, enabling "additional configurations"; 4. Reading and flashing ECU/TCU programs: This facilitates manufacturers in updating the control programs of the ECU at any time, but it is not recommended to modify them yourself.

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