Your phone can't serve as a standalone OBD-II scanner. It must be paired with an OBD-II scanner like the Panlong Bluetooth OBDII Car Diagnostic Scanner, the Innova CarScan Advisor 5210, and the BlueDriver Bluetooth Pro OBDII Scan Tool. You can install OBD-II scanner apps on your smartphone to help you get a code definition. But the scanner apps must be connected to an OBD-II scanner for it to work.