The OBD2 codes list PDF is available on the internet and most of them can be downloaded for free. Having a car may require you to deal with the errors and failure as well. And if you are not too familiar with it then you need to buy a scanner or a code reader. The tool will help you to find out the failure in your car after you see that the check engine light is turned on.
The OBD2 scanner can do several things. Depending on its type, the scanner or code reader could read all generic fault codes. The more advanced unit could even reveal the manufactured-specific fault codes. The codes can be reset or cleared as well. But we do not recommend you to clear the codes unless you have already fixed the problem.
The code reader is kind of a first aid for your car. It does not matter if you eventually bring your car to the auto repair shop but at least you already know what is wrong with your car. If you can repair your car on your own then you might need to purchase the advanced scanner tool instead of a simple code reader. After the code shows up on the screen, you just need to read the OBD2 codes list PDF.