A car code scanner is a small device that connects to a vehicle’s OBD port and displays error codes. This information empowers the driver to make informed decisions about repairs and potentially save money. This is the same technology used by professional mechanics, but is now available for home use.

Modern vehicles use an onboard diagnostic system (OBD) to monitor and control the engine, transmission, airbags, power steering, braking, and more. The system can alert drivers to a problem through the check engine light or by displaying a warning on the dashboard. Some problems are severe enough to require immediate repair, but many others simply require attention at some point in the future. The codes that trigger these lights are written to the car’s computer and can be read with a car code scanner.

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The process of using a car code scanner is straightforward. Most devices are small and portable, requiring only a power source and a compatible OBD-II connector. The OBD port is typically located under the steering wheel, in the center console, or in some cases behind the dash. Plug the scanner in and follow the directions on the screen to read the codes. Some scanners will figure out what the code means for you, but if they only pull the number you may need to look it up yourself.

There are many types of scanners on the market, from bare-bones devices to more advanced tools. Some are designed to interface between a tablet or smartphone and the OBD port, while others have built-in testing equipment. Most are compatible with most OBD-II vehicles manufactured since 1996.