Specifications: Installation And Calibration: Pull the Car Key out from the ignition. Find OBD2 connector(*) in your car and Plug in EcoOBD2. Insert the key into the ignition and twist the key to the first stage. (Do not start the car). Press the reset button for about 5 sec. After releasing the button, just wait for a while about 30-54 sec. (EcoOBD2 will communicate and establish a connection with ECU). Start up the engine. EcoOBD2 will recognize your vehicle and your driving habits, after around 200 km/150 miles driving and thus EcoOBD2 will adjust itself to match your car perfectly for more fuel saving. About Vehicles OBD2 Connector: Does your car have an OBD2 connector? On-Board Diagnostics, or "OBD," is a computer-based system built into all 1996 and later light-duty vehicles and trucks, as required by the Clean Air Act Amendments of 1990. OBD systems are designed to monitor the performance of some of an engine's major components including those responsible for controlling emissions. Where located OBD2 connector in your car? Driver's side, underneath the dashboard, in the area under the steering column. Driver's side, underneath the dashboard, between the driver-side door and steering column area. Driver's side, underneath the dashboard, between the steering column area and the center console. Driver's side, dashboard instrument/gauge area, between the steering column and center console. Driver's side, dashboard instrument/gauge area, between the driver-side door and steering column. Center console, vertical surface left of vehicle centerline. Center console, the vertical surface right of vehicle centerline or on the passenger side of center console. Center console, horizontal surface in front passenger area.