ON CERTAIN MINI VANS AND PASSENGER VEHICLES, THE SOCKET HOLDER IN THE FOG LIGHTS IS INSTALLED IN THE LAMP CASING USING PRESSURE. DURING OPERATION OF THE FOG LIGHT, THE HEAT FROM THE BULB CAN EXPAND THE SOCKET HOLDER. THE EXPANSION CAN FORCE THE SOCKET HOLDER REARWARD. AFTER REPEATEDLY BEING SUBJECT TO THIS EXPANSION, IF THE FOG LIGHT IS ALSO SUBJECTED TO VIBRATION DURING VEHICLE OPERATION, THE SOCKET HOLDER WITH THE BULB HOLDER AND THE WIRING HARNESS MAY SEPARATE FROM THE FOG LIGHT CASING.