One problem related to headlights has been reported for the 2009 Mercury Mariner. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Mercury Mariner based on all problems reported for the 2009 Mariner.
The contact owns a 2009 Mercury Mariner. The contact stated that the vehicle experienced a failure in which the front driver's side headlight assembly would fill up with water and fog, severely reducing visibility. The vehicle was taken to an authorized dealer and the headlight was repaired. The failure continued to occur. The manufacturer offered no assistance. The failure mileage was unknown.