What is the use of OBD in a car?

[Sabrina]

OBD refers to the On-Board Diagnostics system. The following are the relevant introductions: 1. It locates and describes faults in specific parts or components to facilitate repairs. 2. It alerts for faults that may lead to excessive emissions, thereby notifying the increase in environmental impact due to pollutant emissions. 3. OBD1 in China only required compliance with Euro 3 emission standards before July 2010. After that, all vehicles were required to have OBD2 functionality, which includes additional alert features for excessive pollutant emissions, misfires leading to excessive emissions, deterioration of oxygen sensors causing excessive emissions, and degradation of catalytic converters resulting in excessive emissions.