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

1 Answers
VonGemma
07/29/25 4:57pm
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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