What does OBD mean in a car?

1 Answers
SanRobert
07/29/25 6:00pm
OBD refers to the On-Board Diagnostics system. More information about OBD is as follows: 1. OBD stands for On-Board Diagnostics, which translates to a detection system extended for automotive fault diagnosis. 2. The OBD system continuously monitors the vehicle's exhaust emissions during engine operation. If emissions exceed the standard, it will immediately issue a warning. When a system failure 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.
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