Problems · NHTSA complaints

2009 Mercury Mountaineer problems

Owners filed 6 complaints about the 2009 Mercury Mountaineer with NHTSA between Sep 2010 and Nov 2022. The most-cited component is steering (2).

Complaints
6
Filed with NHTSA
Crashes
0
Reported by owners
Fires
0
Reported by owners
Injuries
0
People reported injured
Deaths
0
Reported to NHTSA
01 —By component

Complaints by component

One complaint can cite several components
  1. Steering2
  2. Seats2
  3. Service brakes1
  4. Electrical system1
  5. Vehicle speed control1
  6. Other / unknown1

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.

Data from NHTSA Complaints API · synced Nov 10, 2026NHTSA vehicle page
02 —Trend

When complaints were filed

Does it get worse with age? Complaints per calendar year filed
View as table
Model yearComplaints filed per calendar year
20101
20110
20120
20131
20141
20151
20160
20170
20181
20190
20200
20210
20221

Mileage at failure isn’t a structured field in NHTSA complaint data, so we don’t chart it. Some owners mention it in their reports below.

03 —Owner reports

Top problems in owners’ words

Verbatim from NHTSA complaints, newest first

Steering

2 reports
“The contact owns a 2009 Mercury Mountaineer. The contact stated while making a left or right turn, she heard an abnormal noise, and the steering wheel became difficult to turn. The contact stated that the Roll Stability Control (RSC) warning light was illuminated. The contact took the vehicle to the local dealer, where it was diagnosed with needing the Roll Stability Control (RSC) to be replaced. The vehicle was repaired but continued to experience the failure. The manufacturer had not been informed of the failure. The failure mileage was approximately 118,000.”
Owner complaint to NHTSAFiled Nov 17, 2022Steering, Service brakesODI 11493929

Seats

2 reports
“TL*THE CONTACT OWNS A 2009 MERCURY MOUNTAINEER. THE CONTACT STATED THAT WHEN THE KEY WAS INSERTED IN THE IGNITION SWITCH TO START THE VEHICLE, THE POWER SEAT FAILED TO MOVE FORWARD FROM THE EASY EXIT POSITION. THE CONTACT STATED THAT THE POWER SEAT WOULD ALSO MOVE BACKWARDS IN A POSITION THAT PREVENTED THE CONTACT FROM REACHING THE BRAKE PEDAL. IN ADDITION, THE AIR BAG WARNING INDICATOR ILLUMINATED WHEN THE FAILURE OCCURRED. THE FAILURE RECURRED ON SEVERAL OCCASIONS. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 45,000. UPDATED 5/28/15 *TA THE CONSUMER STATED THE SEAT DID MOVE FORWARD FROM EASY EXIT, BUT IMMEDIATELY OR WHEN STARTING VEHICLE RETURNED TO EASY EXIT. THE DEALER DIAGNOSED THE FAILURE AS A WEAK BATTERY. VEHICLE WAS REPAIRED. UPDATED 9/17/2015*JS”
Owner complaint to NHTSAFiled Mar 24, 2015SeatsODI 10701469

Service brakes

1 report

Electrical system

1 report
“HAVE A 2009 MERCURY MOUNTAINEER WITH 71,000 MILES. IN THE PAST 10 DAYS, HAVE HAD FOUR INCIDENTS WHERE, WHILE DRIVING, THE DRIVER'S SIDE POWER FRONT SEAT HAS SUDDENLY REVERTED TO THE EASY EXIT POSITION. WE BOUGHT THIS CAR USED WITH 22,000 MILES. HAVE HAD THE CAR FOR FOUR YEARS. MY WIFE AND I ARE TALL; HOWEVER, EVEN AT THAT, WHILE DRIVING AT SPEEDS BETWEEN 55-70 (ON TURNPIKES AND MAJOR HIGHWAYS), THIS IS STILL AN ISSUE. TOOK CAR TO A FORD DEALER IN READING, PA - ON A SATURDAY (MAYBE THEY DON'T DO AS MUCH INTENSIVE DIAGNOSTICS ON WEEKENDS?) RECENTLY WHO FOUND NO ISSUES ALTHOUGH THEY INDICATED OTHER MOUNTAINEERS OF THE 2002 OR 2005 MODELS HAD SIMILAR ISSUES AND IT APPEARED TO BE AN PROBLEM WITH THE IGNITION SWITCH. DID NOT GET THE IGNITION REPLACED BUT THE SEAT MOVED AGAIN TODAY WHILE MY WIFE DROVE THE CAR. WILL GO BACK TO THE FORD DEALER DURING THE WEEK TO GET MORE INTENSIVE DIAGNOSTICS. *JS”
Owner complaint to NHTSAFiled May 19, 2014Electrical system, SeatsODI 10592417

Vehicle speed control

1 report
“TL* THE CONTACT OWNS A 2009 MERCURY MARINER. THE CONTACT STATED THAT WHILE DRIVING 60 MPH, THE VEHICLE STALLED AND THE WARNING LIGHTS ILLUMINATED. THE CONTACT HAD TO SHIFT TO PARK AND RESTART VEHICLE TO RESOLVE THE FAILURE. THE VEHICLE WAS TAKEN TO THE DEALER WHO DETERMINED THAT THE THROTTLE POSITION SENSOR HAD FAILED. THE THROTTLE POSITION SENSOR WAS REPLACED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE FAILURE AND CURRENT MILEAGE WAS 47,000.”
Owner complaint to NHTSAFiled May 14, 2013Vehicle speed controlODI 10511893
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 10, 2026

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.