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How many OBD ports can a car have?

1 Answers

LucyMarie

07/29/25 11:55pm

A car can have 1 OBD port. Here are the specific details about the OBD system: 1. Definition: OBD stands for On-Board Diagnostics, which translates to a detection system extended for automotive fault diagnosis. 2. Working Principle: The OBD system continuously monitors the engine's operating conditions to check if the vehicle's emissions exceed standards. If they do, it will immediately issue a warning. When a system fault occurs, the Malfunction Indicator Lamp (MIL) or Check Engine warning light will illuminate, and the Powertrain Control Module (PCM) will store the fault information in memory. The fault code can be read from the PCM through a specific procedure. Based on the fault code, maintenance personnel can quickly and accurately determine the nature and location of the fault. 3. Scope of Coverage: The OBD system monitors in real-time the engine, catalytic converter, particulate filter, oxygen sensor, emission control system, fuel system, EGR system, and other components. It then connects to the ECU through various emission-related component information.

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