A:Answer This device is installed in the OBD II port of your vehicle. This is typically located on the interior of the vehicle under the dash, usually below the steering wheel or below the glove compartment. It's very small and discreet and most people don't even notice it's installed. If the OBD port is under the hood of your car, I would guess it's older than 1996. Autobrain is recommended only for 1996 and newer vehicles and probably wouldn't work properly. Also, the Autobrain User's Manual recommends the operating temperature not exceed 75 C and in the summer heat under hood temps can reach 82-93 C, so it would likely ruin the device if it's installed under the hood. If you don't want it to be at all visible you could also buy an OBD port replicator extension cable and install that with Autobrain under the dash to make it completely non-visable.