Why Does My BMW Headlight Keep Fogging Up?
Image: BMW I3 Series Complete LCI LED Headlight, left passenger side, for sale at MT Auto Parts A light mist that appears overnight, then clears once the headlights have been on for a few minutes is one thing. A persistent, heavy condensation that sits inside the lens and does not shift is quite another. Both look similar from outside the car but have different causes. And only one of them actually requires a BMW headlight replacement . Here is how to tell which you are dealing with and what to do about it. Normal Condensation vs a Genuine Fault BMW headlights are not completely sealed units. They contain a small breather vent, sometimes described as a pressure equalisation tube, that allows air to move in and out as the unit heats up and cools down. This vent is intentional and necessary. Without it, repeated pressure changes would eventually compromise the housing. The trade-off is that the vent allows moist air in, which can produce a light condensation film on the inside of the len...
