What is OBD2 scanner for? The system will store important information about the detected malfunction, but people couldn't see it directly. The OBD2 scanner can help you read the information from car computer, show the error codes and clear the code after fixed the problem. You needn't go to auto shop to check, just do it yourself, and save time and money. How to use OBD2 scanner? CAUTION: Don't connect or disconnect any test equipment with ignition on or engine running. 1) Turn the ignition off. 2) Locate the vehicle's 16-pin Data Link Connector (DLC). 3) Connect the diagnostic cable into the vehicle's DLC socket. 4) Turn the ignition on. 5) Select [Diagnose] on the menu. What cars does this OBD2 scanner work on? This code reader works on most 1996 US-Based, 2000 EU-Based and Asian cars, and newer OBDII & CAN domestic or imported vehicles. It's suitable for American, European and Asian cars that are either OBD2 or CAN compliant. If you're not sure if this OBD2 scanner works on your car, please send the car model and year to us, we will check for you and reply soon. How to update this OBD2 scanner? Kindly note that the Topcon Plus that you bought can work when received, or you can update it via the official website (website on item back, package box or user manual), download the updating tool (choose the file: Topcon Plus & Elite) to upgrade it. Additionally, the upgrading tool only supports Windows operating system. Should you have any problem, please send us email at any time.