AI Damage2005 Mercury Mountaineer: common problems
Owners of the 2005 Mercury Mountaineer filed 82 complaints with NHTSA, most often about structure and powertrain. Details by component below, with sources.
Key figures
- Owner complaints
- 82
- involving a crash
- 6
What fails most often
- 1 Structure 32% of all complaints
- 2 Powertrain 23% of all complaints
- 3 Vehicle speed control 16% of all complaints
- 4 Engine 9% of all complaints
- 5 Electrical system 6% of all complaints
- 6 Engine and cooling 6% of all complaints
- 7 Service brakes 6% of all complaints
- 8 Steering 6% of all complaints
- Structure: 26 complaints (32% of all), 1 of them with a crash reported by the owner.
- Powertrain: 19 complaints (23% of all), 1 of them with a crash reported by the owner.
- Vehicle speed control: 13 complaints (16% of all), 3 of them with a crash reported by the owner.
- Engine: 7 complaints (9% of all).
- Electrical system: 5 complaints (6% of all), 1 of them with a crash reported by the owner.
Engines and transmissions
US-market versions per EPA. On the right: how many NHTSA complaints name this engine or transmission type.
- 4 L · petrol · 6 cyl
- 4.6 L · petrol · 8 cyl
- automatic, 5-speed
Drive: RWD, AWD
Symptoms owners describe
How many of the 82 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Structure | 26 | 1 | 0 |
| Powertrain | 19 | 1 | 0 |
| Vehicle speed control | 13 | 3 | 0 |
| Engine | 7 | 0 | 0 |
| Electrical system | 5 | 1 | 0 |
| Engine and cooling | 5 | 0 | 0 |
| Service brakes | 5 | 1 | 0 |
| Steering | 5 | 0 | 0 |
| Visibility | 4 | 0 | 0 |
| Air bags | 3 | 2 | 0 |
| Equipment | 2 | 0 | 0 |
| Fuel system | 2 | 0 | 0 |
| Electronic stability control | 1 | 0 | 0 |
| Fuel/propulsion system | 1 | 0 | 0 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
Issue with this car also is the electric driver window dies out mechanic could not figure out bought new motors still wouldnt open electric switches they thought it was fully electronic they where going to re wire very expensibe but car was totalled. Car horrible on gas also.
The air bags did not deploy. A police report was filed. The passenger in the contact's vehicle sustained injuries to the back, neck, and spine which required medical attention. The vehicle was destroyed and towed to a collision center. The failure mileage was unavailable.
On december of 2007, I drove into my garage at a slow speed. I applied the brakes to be able to park the suv. The car would not stop until it hit the inner wall of the house. The air bag did not go off after the impact.. Took the car in after repair to front of car was done.
Accelerator: speed control car lurched out of control in reverse and forward intermittently.
The car slipped into reverse and rolled down driveway striking mailboxes across street.
started losing power ,did not want to go pas 30 miles per hr ,then it ramed up and came to a stop with no acceleration ,i shut it off then start it again and was able to get home at a low rate of speed while continuing to have these problems, another day while far away from home the engine rammed up again minimizing…
Tl* the contact owns a 2005 mercury mountaineer equipped with four cooper discoverer h/t tires, size: 245/65r17. The contact stated that all four tires rumbled and rode roughly instead of providing a smooth, stable ride while driving at any speed.
Noticed dashboard lights were all lit and battery gage was normal. I lost power steering, brakes and oil pressure. After pulling safely to the side of the road, I rested for 30 seconds before restarting the car, which subsequently operated normally.
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 4,021 of 36,656 model years in the NHTSA data (top 11% most complained about).
On average one model year of the Mountaineer has 125 complaints (16 years in the data). This year has 82, below average.
What to check before buying
- Structure. Rails, pillars, panel gaps, signs of pulling or welding.
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
- Vehicle speed control. Accelerator pedal, cruise control, throttle codes.
- Engine. Cold start, unusual noises, oil leaks and engine codes.
Other years of this model
- Mountaineer 19963 sources
- Mountaineer 1997328 sources
- Mountaineer 1998236 sources
- Mountaineer 1999151 sources
- Mountaineer 2000123 sources
- Mountaineer 200122 sources
- Mountaineer 2002372 sources
- Mountaineer 2003152 sources
- Mountaineer 2004210 sources
- Mountaineer 2006117 sources
- Mountaineer 200781 sources
- Mountaineer 200896 sources
- Mountaineer 20096 sources
- Mountaineer 201013 sources
- Mountaineer 99999 sources
Questions and answers
What are the most common problems with the 2005 Mercury Mountaineer?
Owner complaints to NHTSA most often mention: structure, powertrain, vehicle speed control. Total complaints: 82. The most frequent symptoms in complaint texts: stalls while driving (11%), windows, sunroof (11%), jerking, harsh shifts (10%).
How many service bulletins (TSB) were issued for the 2005 Mercury Mountaineer?
NHTSA lists 0 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2005 Mercury Mountaineer from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2005 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-05.