The contact owns a 2005 Mercury Grand Marquis. The contact stated while driving at an undisclosed speed at night, the contact became aware that the front headlamps had intermittently failed to provide proper illumination, greatly reducing nighttime visibility. No warning lights were illuminated. The vehicle was not taken to the dealer or an independent mechanic. The vehicle was not repaired. After investigating the failure, the contact related the failure to NHTSA Campaign Number: 15V861000 (Exterior Lighting); the VIN was included, but the vehicle was already repaired under the recall. The manufacturer was not notified of the failure. The failure mileage was 211,000.