So I just bought a 2k Maxima and the previous owner replaced the headlights about three months ago. They're very clear and nice looking. However, the passenger side headlight seems to be fogging up from the inside. Condensation is gathering on the inside of it, and I'm wondering if the headlight isn't sealed properly. There aren't any visible cracks. Anyone else had this happen?

 

I had bugs and dirt getting into one of mine. Couldn't find out how they were getting in there. Long story short, there's a hole or slit somewhere for the moisture to get in. If it's not that bad, you can try to seal off the hole.....if you can find it. Take the headlight out and and see if it's sealed properly.