What is the function of the automotive OBD?

2 Answers
DelRylee
07/28/25 11:24pm
The main functions of the automotive OBD include real-time monitoring of vehicle data; reading fault codes to facilitate car repairs; developing automotive-related functions; and providing convenience for modifying vehicle equipment. The meaning of automotive OBD: Automotive OBD, also known as On-Board Diagnostics, can detect the working conditions of the engine's electronic control system and other functional modules of the vehicle during operation. The meaning of automotive OBD fault codes: Different numbers in automotive OBD fault codes represent different meanings. The first letter indicates the system that set the fault code. The second character is 0, 1, 2, or 3. 0 represents a generic fault code defined by the Society of Automotive Engineers (SAE), 1 represents an extended fault code defined by the vehicle manufacturer, and 2 or 3 represents a system-dependent character. The third character indicates the system with the fault: 1 represents a fuel or air metering fault, 2 represents a fuel or air metering fault, 3 represents an ignition fault or engine misfire, 4 represents an auxiliary emission control system fault, 5 represents a vehicle or idle speed control system fault, 6 represents a computer or output circuit fault, 7 represents a transmission control system, and 8 represents a transmission control system. The last two characters indicate the conditions that triggered the fault code.
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VonCody
08/12/25 3:47am
Last time my car's engine light came on, I was completely panicked. Fortunately, I used the OBD system to diagnose it as an oxygen sensor issue, avoiding a breakdown on the road. OBD is an onboard diagnostic tool installed in vehicles that monitors critical components like the engine and transmission in real-time. It activates warning lights when faults or excessive emissions are detected and records trouble codes. By connecting a mobile scanning tool to the OBD port, I can read data and troubleshoot minor issues, saving both money and hassle. After driving more often, I've realized OBD also helps prevent major problems—like detecting drops in fuel efficiency for timely maintenance. After all, a car is like a body; without regular check-ups, problems are inevitable. Modern cars can't function without OBD—it's mandatory in the EU and China, and repair shops rely on it to quickly service thousands of vehicles.
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