What is the function of obd interface in automobile?

Obd is the abbreviation of English On-Board-Diagnostic, which is translated as "on-board diagnostic system". This system monitors the running state of the engine and the working state of the exhaust aftertreatment system at any time, and will give an alarm once it is found that the emission may exceed the standard. The obd interface of automobile has four main functions: 1. Data display of driving computer: obd interface can provide data of various working conditions of vehicles, such as data displayed by on-board instruments, various fuel consumption records, battery voltage, air-fuel ratio, throttle opening, knocking times, etc. 2. Reading the fault code: the fault code can be read by using the obd interface, which is beneficial to quickly diagnose the vehicle fault and reduce the time of manual diagnosis; 3. Change the code to achieve more functions: access the vehicle CAN bus through the data line of obd interface, and adjust the code of each module to achieve many different "hidden" functions; 4. Read and write ECU-TCU program: It is convenient for manufacturers to update ECU control program at any time, but it is not recommended to modify it by themselves.