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Check Engine Light Diagnostics: When Check Engine is Light on. With an OBD app, the Bluetooth OBD2 Scanner will read the error codes so you can check what's wrong with your vehicle and possibly save you a trip and cost to the mechanic for minor issues. Real-time Sensor Reading: There's tons of information available in your vehicle's computer systems, but most of it is not displayed on the vehicle dashboard. With this device and an OBD App, you can access a whole new world of information about your vehicle directly on your phone or tablet, such as Engine Fault Diagnosis, Engine Fault Light Clearing, Read Code, Erase Code, View Freeze Frame, Reading Vehicle Information, Data Flow, Live Data Curve, etc.