Determine the cause of the problem. Start by checking your car’s manual. Many manufacturers include information on how to read error codes in the owner’s manual. If you can’t find anything there, don’t worry—we’ll show you some other ways to get the information you need. Depending on the make and model of your car, you may be able to connect a diagnostic tool and read the codes yourself. Alternatively, you can take your car to a qualified mechanic who can use a diagnostic tool to troubleshoot the problem. In either case, it’s important to get the issue diagnosed and repaired as soon as possible to avoid further damage to your car.