What devices can be connected to the OBD port?

1 Answers
PresleyRose
07/30/25 4:47am
OBD ports cannot be connected to external devices, as external devices may affect the vehicle itself through the OBD port due to their own malfunctions or issues. OBD stands for On-Board Diagnostics, and its functions are: 1. To locate and describe faults in specific parts or components, facilitating repairs; 2. To alert when faults cause emissions to exceed standards, indicating an increase in environmental pollution. OBD includes: 1. EGR; 2. Engine; 3. Particulate filter; 4. Catalytic converter; 5. Oxygen sensor; 6. Emission control system; 7. Fuel system. The working principle of OBD is: when an emission fault occurs, the ECU records the fault information and related codes, and notifies the driver by illuminating the fault light or check engine light.
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