What to Do When Moisture and Fog Appear in the Rear Tail Lights?

[Wren]

When moisture and fog appear in the rear tail lights, the fog will usually dissipate through the vent tube as the light heats up after being turned on for a while. This generally does not damage the tail lights or electrical circuits. However, if large areas of fog condense on the inner surface of the lens and form droplets that flow down and accumulate inside the light, or if the fog repeatedly adheres to the surface of the lens when the tail lights heat up during prolonged or frequent use, this can be considered water ingress. Under normal circumstances, if moisture and fog inside the tail lights are caused by poor sealing, the fog will only dissipate if the vehicle is parked in a dry environment with less than 50% humidity for more than a day without turning on the lights.