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What to Do If the Vehicle Fails OBD Inspection During Annual Inspection?

1 Answers

EmilianoFitz

07/30/25 5:33am

Failing the OBD inspection during vehicle testing is generally caused by faults in the vehicle's computer system. You can visit a 4S repair shop to diagnose and eliminate the faults, thereby clearing the fault codes. If the issue is due to an outdated OBD system or unsuccessful communication between the OBD diagnostic tool and the vehicle, you can go to a 4S shop to upgrade the vehicle system before retesting. Below are detailed solutions: 1. Vehicle has fault codes: Solution: If the warning light is off but fault codes are present, promptly update the software and OBD system. If fault codes persist after updating, visit a 4S shop to verify the existence of fault codes and clear them. If fault codes reappear after clearing, the vehicle may indeed have a fault, and immediate repair is recommended. If the 4S shop detects no fault codes, inquire whether the ECU system can be upgraded to the latest version. 2. OBD communication or connection failure: Solution: Check the vehicle's OBD port for dust and clean it before reconnecting. Inspect the OBD cable for proper functionality. Early low-end vehicles may lack emission monitoring capabilities in their ECU systems; visit a 4S shop for a system upgrade. 3. More than two readiness items incomplete: Solution: Drive the vehicle sufficiently to allow all sensors to reach optimal conditions before retesting. Perform a deeper inspection to check for fault codes. If previous methods fail to resolve the issue, visit a major repair shop or 4S shop for further diagnostics. 4. Connection failure: Solution: Upgrade the inspection station's OBD version to the latest and try again, or visit a 4S shop to check if the vehicle's OBD is registered in the database.

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