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What does it mean when OBD appears on the car?

1 Answers

SanMadeline

07/29/25 9:58am

When OBD appears on the car, it indicates an emission fault. The working principle of OBD: When an emission fault occurs, the ECU records the fault information and related codes, and notifies the driver through the illumination of the fault light or the check engine light. OBD includes: 1. EGR; 2. Engine; 3. Particulate filter; 4. Catalytic converter; 5. Oxygen sensor; 6. Emission control system; 7. Fuel system. The functions of OBD are: 1. To locate and describe the faulty parts or components, facilitating repairs; 2. To alert about faults that cause excessive emissions, indicating an increase in environmental impact due to pollutant emissions.

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