There are 1 stored owner reports matching the lighting leading-label group for the 2005 Mercury Mariner in our NHTSA-sourced dataset. These are unverified consumer reports and may not reflect confirmed defects.
This group counts stored reports whose component label starts with one of this site's matching prefixes, ignoring case. Each matching report counts once within the group. Components mentioned later in the label or only in the narrative are not searched. How component counts work
Loaded 1 of 1 matching reports.
Open the full vehicle complaint log (all categories)TL* THE CONTACT OWNS A 2005 MERCURY MARINER. WHILE DRIVING APPROXIMATELY 60 MPH, THE EXTERIOR HEADLIGHTS FAILED. THE CONTACT SWITCHED TO THE AUTOMATIC LIGHT SYSTEM. THE VEHICLE WAS TAKEN TO THE DEALER WHERE IT WAS DIAGNOSED AS A LIGHT SWITCH FAILURE. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 150,000.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
NHTSA source checks for this vehicle year
Checks are recorded separately for each dataset, not for the whole page. Dates use UTC. A missing check date does not mean no records exist.
Vehicle import recorded: Apr 28, 2026. This is the stored import date, not confirmation that every source was successfully refreshed.