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What are the reasons for OBD failure?

1 Answers

DelHadley

07/30/25 6:39am

The reasons for OBD failure are: 1. caused by an outdated OBD system; 2. due to malfunctioning sensors in the OBD system; 3. engine failure. OBD stands for On-Board Diagnostics, which continuously monitors the vehicle's operating conditions during operation, working in conjunction with numerous sensors to monitor the engine's operating status and the performance of the exhaust treatment system in real time. OBD monitors the engine, catalytic converter, particulate filter, oxygen sensors, emission control system, fuel system, EGR system, and related components in real time. It connects to the ECU with various emission-related component information. When an emission fault occurs, the ECU records the fault information and related codes, and issues a warning through the malfunction indicator lamp to inform the vehicle owner.

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