Problems · NHTSA complaints
1999 Mercury Mountaineer problems
Owners filed 160 complaints about the 1999 Mercury Mountaineer with NHTSA between Jun 1999 and May 2018. The most-cited component is tires (52).
Complaints
160
Filed with NHTSA
Crashes
16
Reported by owners
Fires
5
Reported by owners
Injuries
14
People reported injured
Deaths
1
Reported to NHTSA
Complaints by component
One complaint can cite several components
- Tires52
- Visibility24
- Air bags16
- Vehicle speed control12
- Engine and engine cooling12
- Electrical system10
- Service brakes, hydraulic9
- Power train8
- Equipment6
- Structure5
- Suspension4
- Seats4
- Steering4
- Seat belts3
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
When complaints were filed
Does it get worse with age? Complaints per calendar year filed
23
42
13
12
17
17
11
3
6
6
1
0
4
0
1
1
0
1
0
2
View as table
| Model year | Complaints filed per calendar year |
|---|---|
| 1999 | 23 |
| 2000 | 42 |
| 2001 | 13 |
| 2002 | 12 |
| 2003 | 17 |
| 2004 | 17 |
| 2005 | 11 |
| 2006 | 3 |
| 2007 | 6 |
| 2008 | 6 |
| 2009 | 1 |
| 2010 | 0 |
| 2011 | 4 |
| 2012 | 0 |
| 2013 | 1 |
| 2014 | 1 |
| 2015 | 0 |
| 2016 | 1 |
| 2017 | 0 |
| 2018 | 2 |
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.
Top problems in owners’ words
Verbatim from NHTSA complaints, newest first
Tires
52 reports5 crashes1 related recall
“TL* THE CONTACT OWNS A 1999 MERCURY MOUNTAINEER EQUIPPED WITH COOPER DISCOVERER H/T TIRES, SIZE: P265/75R15. WHILE DRIVING APPROXIMATELY 70 MPH, A LOUD BANGING NOISE CAME FROM THE REAR OF THE VEHICLE. AFTER STOPPING TO INSPECT THE VEHICLE, IT WAS DISCOVERED THAT THE REAR DRIVER SIDE TIRE HAD EXPERIENCED TREAD SEPARATION, WHICH ALSO CAUSED DAMAGE TO THE REAR BODY PANEL OF THE VEHICLE. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE VIN AND TIRE FAILURE MILEAGE WERE UNKNOWN. THE VEHICLE FAILURE MILEAGE WAS 180,000. *TR”
Visibility
24 reports
“FRONT WIPERS STOP WORKING. THIS OCCURS ABRUPTLY WITHOUT REGARD TO WEATHER CONDITIONS, TIME THE CAR IS RUNNING, ETC. I HAVE REPLACED BOTH THE MOTOR AND THE SWITCH. THE WIPERS STILL FAIL. THIS IS VERY DANGEROUS. *TR”
Air bags
16 reports7 crashes
“EXPLODING AIRBAGS FILLED VEHICLE WITH SMOKE AND ASH. I RECEIVED MINOR BURNS AND ABRASIONS ON ARMS AND FACE, DAUGHTER RIDING IN BACK SEAT RECEIVED BLACK EYE FORM FLYING OBJECT AND REQUIRED SCAN OF HEAD TO RULE OUT HEAD INJURY. WAS RESULT OF ACCIDENT”
Vehicle speed control
12 reports4 crashes3 related recalls
“CURSE CONTROL OCCASIONALLY MAKES ENGINE ACCELERATE WHILE AND AFTER BRAKE APPLIED WHILE MOVING UNDER 5 MPH AND EVEN WHILE STOPPED WITH BRAKE STILL APPLIED. MORE THAN ONCE A PEDESTRIAN WAS AT RISK IN A CROSSWALK WHILE VEHICLE STOPPED WITH BRAKE STILL APPLIED, THEN ENGINE SUDDENLY BECAME NEAR FULL THROTTLE, REQUIRING EVEN STRONGER PRESSING OF BRAKE PEDDLE. WE TOOK THE CAR TO DEALER (HENRY DAY FORD) WHO UPDATED ENGINE CONTROL ROM; BUT SAME PROBLEM CONTINUED TO EXIST. THE DEALER OFFERED NO WARRANTY OF REPAIR OR EVEN ACKNOWLEDGEMENT OF PROBLEM. WE NOW DRIVE WITH THE CRUSE CONTROL AND HORN AND ??? CABLE DISCONNECTED NEAR WINDSHIELD WASHER RESERVOIR.”
Engine and engine cooling
12 reports2 fires
“TL* THE CONTACT OWNS A 1999 MERCURY MOUNTAINEER. THE CONTACT STATED THAT THE VEHICLE WAS PARKED AND IDLE WHEN IT CAUGHT IN FIRE FROM THE ENGINE AREA AND SPREAD TO THE INSTRUMENT PANEL. THE INSTRUMENTAL PANEL AND THE ENGINE COMPONENTS WERE COMPLETELY MELTED. THE FIRE DEPARTMENT WAS CALLED AND ADVISED THAT THE FIRE ORIGINATED AT THE ENGINE. A FIRE REPORT WAS FILED. THE VIN WAS NOT AVAILABLE. THE VEHICLE WAS DESTROYED. THE FAILURE AND THE CURRENT MILEAGE WAS 160,000.”
Electrical system
10 reports2 fires1 related recall
“HAVE BEEN HAVING TROUBLE WITH DOOR LOCKS, DELAY SWITCH ON REARVIEW MIRROR, WINDOW LOCK AND WINDOW FUNCTIONS, ABS ON ALL THE TIME ,DOOR AJAR LIGHT ON ALL THE TIME. NONFUNCTIONING DOME LIGHT SWITCHES AND INTERMITTENT CHECK ENGINE LIGHT ( WHICH WHEN CHECKED WAS DETERMINED TO BE SOME UNKNOWN INSUFFICIENT EXHAUST FLOW ISSUE). CONSTANT CLICKING NOISES COMING FROM THE FAR LEFT DRIVERS SIDE OF DASH. WE NOTICED A FLAME COMING OUT OF MY LEFT FRONT TOP DASH VENT AFTER CAR HAD BEEN PARKED FOR 5+ HOURS. IT'S OBVIOUS THE FIRE STARTED IN THE DASH AND IT BURNT BOTH OF THE WIRING HARNESSES UNDER THE LEFT FRONT CONTROL PANEL HITTING THE VENT LINE AND COMING OUT THE TOP VENT OF THE DRIVERS SIDE OF THE DASH. WE HAD TO POOR BUCKETS OF WATER INSIDE DASH VENTS/ OPENINGS AND FRONT HOOD AREA TO GET THE FLAMES OUT. OUR INJURIES WERE INCURRED WHILE TRYING TO PUT OUT THE FIRE. *TR”
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.