Originally Posted by Modshack

Not necessarily..These light are not really "sealed" despite the fact that they're glued together, there are lots of ways air gets in. Change in atmosphere, humidity etc. especially at this time of year where there are big temp swings from day to night, will easily cause condensation inside the lens depending on where you park at night..It'll disappear after the temps equalize..

I would seriously doubt Nissan would allow these to be replaced under warranty...