The DTC provides a general direction for troubleshooting, but the user is responsible for identifying the specific issue. These codes are accompanied by brief descriptions that may not always be immediately clear about the exact issue, similar to someone reporting a stomachache when they have food poisoning. The OBD-II system represents vehicle error codes as five-digit Diagnostic Trouble Codes (DTC). You can start an engine while scanning, but it does carry a risk of further damage, depending on what's wrong with the vehicle. To access the information, connect the diagnostic scanner to the OBD-II port (it only plugs in one way) and turn the vehicle to the "on" position without turning on the engine. OBD-II ports are typically found beneath the dashboard on the driver's side. Consider using a diagnostic scanner if you find yourself disassembling cars and confidently putting them back together.
Other features in diagnostic scanners include technical service bulletins (TSBs), technical advice, module testing, and graphing. Display scanners are affordable, with fewer bells and whistles, but they lack the additional functions that diagnostic scanners provide.įor those who are a bit more serious about their auto repair, diagnostic OBD-II scanners provide more information on the car's inner workings, such as engine coolant temperature and air-fuel ratio. After pulling the code, additional research will determine its meaning and let you determine your next steps. This code provides limited information but is a solid starting point. During our testing, we developed two unofficial categories: display and diagnostic OBD-II scanners.ĭisplay OBD-II scanners display error codes that your vehicle's computer generates. Used correctly, they can save you a bundle in auto diagnostics and repair costs. OBD-II scanners vary greatly in price, ranging from tens of dollars to thousands. Depending on the scanner, you can access as much or as little data as you need to begin the diagnostic process. This port is like a direct connection to your car's critical ECU components, similar to monitoring the health of a body's vital systems.
In 1996, the Environmental Protection Agency made the OBD-II port mandatory in all U.S. Show more Things to Consider When Shopping for an OBD-II Scanner
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