Auto Car Diagnostic Code Reader Scanner Diagnostic Equipment Reset Inspection and Oil Service Operating Instructions: Usage: 1.Plug the Device into the 20 pin diagnostic socket of the car located in the engine compartment 2. Turn ignition key to enable the board electronic but don`t turn on the motor 3. Press the button for the operation you want to perform and keep it pressed 4. The LED of the choosen operation will be on 5. Keep the button