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What is the reason for the inability to read OBD during vehicle inspection?

2 Answers

VonGemma

07/29/25 8:57am

It could be due to instrument malfunction or insufficient data. The specific details are as follows: 1. Appearance conditions: The OBD interface is generally a 16-pin female connector with a trapezoidal shape. Some vehicle models have a protective cover on the OBD port, and common OBD interfaces are black, white, or blue. 2. Information processing capability: OBD continuously monitors systems and components such as the engine, catalytic converter, particulate filter, oxygen sensor, emission control system, fuel system, EGR, etc. It then connects to the ECU through 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 fault light to inform the driver. The ECU ensures access to and processing of fault information through a standard data interface.

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Manuel

08/12/25 7:43am

As a car enthusiast, I often tinker with my car. It's quite common to encounter issues where the OBD can't be read during an inspection. First, the most common reason is a problem with the interface port, such as it being clogged with dust or physically damaged, which can cause the device to not respond when plugged in. It could also be due to a blown vehicle fuse, especially those near the headlights or cigarette lighter, which protect the circuit and will break if overloaded. Secondly, system protocol incompatibility is another issue. Older car models use the OBD-I system, while current inspection tools use the OBD-II standard. If the software can't detect data, it will report an error. Another factor is low vehicle battery voltage. Insufficient power can affect the diagnostic module's startup, so you need to ensure the battery isn't drained. Additionally, if the car has just been turned off or the engine is in some test mode, the system may lock the port. Just wait a few minutes and restart the car. I've also seen bugs caused by improper modifications, such as installing third-party electrical devices that interfere with the signal. In general, these minor issues can be checked by yourself—inspect the port's cleanliness and the battery. If all else fails, go to a professional shop to upgrade the tools to avoid delaying the inspection.

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