2009 Mercury Mariner: Reliability Data
When Do Complaints Happen?
Distribution of NHTSA complaints by vehicle mileage at time of report.
What Fails?
Most reported component issues from NHTSA complaints.
Severity Assessment
Sample Complaint Reports
"ENGINE STALLS AND PICK-UP IS WOBBLY. *TR"
"FORD MOTOR CO. PRODUCED 2009 & 2010 MERCURY MARINER VEHICLES' FUEL SYSTEM LEAKS GAS WHEN ATTEMPTING TO TOP OFF THE GAS TANK. ALL FORD VEHICLES PRODUCED OVER THE PAST TWO YEARS MAY BE AFFECTED. FORD WILL NOT FIX THE PROBLEM AND TELLS THE CUSTOMER TO NOT TOP OFF THE GAS TANK ALTHOUGH NOTHING IS INCL..."
"TL*THE CONTACT OWNS A 2009 MERCURY MARINER. WHILE DRIVING APPROXIMATELY 65 TO 70 MPH ON NORMAL ROAD CONDITIONS; THE TRANSMISSION SLIPPED WITH EXCESSIVE VIBRATION. THE ENGINE BEGAN TO REV AND THE RPM'S WERE HIGH. SUDDENLY, PRESSURE WAS APPLIED TO THE ACCELERATOR PEDAL, HOWEVER, THE RESPONSE WAS MINI..."
Source: NHTSA ODI Complaints Database. Names and identifying details omitted.
When Were Complaints Filed?
Number of complaints by the year the issue occurred.
When Does Each Component Fail?
Median mileage at complaint for top components.
Where Are Complaints Coming From?
Top states by complaint count.
Who Files Complaints?
Mercury Mariner — Other Years
See how this model compares across different model years.
Data source: View this vehicle on NHTSA.gov | NHTSA ODI Complaints Database. Public domain.
Methodology: Complaint counts and mileage distributions are computed directly from consumer-reported NHTSA complaints. This data represents reported issues, not failure rates — vehicles without complaints are not represented. Full methodology.
Data through: 2026-03-28
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