What does the OBD light indicate?

[DeSilas]

OBD light indicates there is an issue with the vehicle's electronic control system or exhaust emissions. The specific condition needs to be checked by professionals at a repair shop or 4S dealership. OBD refers to On-Board Diagnostics system, which consists of a scanner, oscilloscope, and interface. It automatically diagnoses vehicle conditions and sends fault codes to maintenance personnel, enabling them to quickly locate the fault. If the vehicle's OBD interface is occupied, it is generally only used as a power source and will not affect the vehicle itself, as peripheral devices only read the data from the vehicle's computer via the OBD interface without writing programs. Moreover, OBD systems have self-protection functions; writing programs requires entering the correct password. Generally, for safety reasons, it is advisable not to arbitrarily occupy the vehicle's OBD interface.