Camera handy to extinguish the motor control on the dashboard, erase engine defects and detect an engine failure (flow meter, water temperature probe or air, vacuum sensor, etc ..., basically they all respect if the engine is with readings in real-time (very convenient). CAUTION any time because not specified in the announcement the vehicle must be OBD 2 compliant, it's simple all petrol vehicles output after 2001 and all output diesel vehicles after 2004 must comply OBD 2 thereof (standard imposed by the manufacturer europe), to which I do not I board my dépaner AUDI A4 1.8 20V 1998 with this device because it has many OBD 2 socket but non-compliant legacy because the vehicle is too old and therefore the device displays ERR. The device was tested on revenche Sharan TDI 115 2006 Alfa 147 JTD 2006, Mercedes VITO, Audi A4 TDI 140 2008 and Opel Corsa CDTI 70 2005 and it works perfectly. So I recommend this device to your engine troubleshooting more than you can put it in days via internet.