Not sure, but its most probably the aircon compressor oil that's leaking - this also means that the aircon will lose its cooling ability soon (in other words the coolant gas will be lost). Engine oil leak is usually detected in the vicinity of the engine itself.
Look underneth right beside the shaft going to the front
Raise hood look down you will see hoses that is it in front behind grill
Toyota Previa fuse box is located underneath center console. It has a latch mechanism holding it in place at front of console but can be pried up with flat edge screw driver.
Under the front passenger seat
Jack location for Toyota PreviaToyota Previa jack and tire iron are located under front passenger seat. Access from front on door side. It is held down with a butterfly screw and/or rubber retaining band. Easy to get out.this is on most united state previa,most European made previa the jack are locate under the driver seat.
under the front driver seat
its on the front of engine just above aux.shaft easy to get to but you have to raise the vehicle saftly and get under it to see it
www.autozone.com
Under neath the vehicle 3 foot or so from the front of the vehicle and towards the left side of the vehicle.
which intake? They're are both at the front under the bonnet
it is located just under the center dome of the dash just feel under front of dome for catch push hard it will pop open
underneath the front cable runs to the back onto the left and right , the nut is there