AI Damage2005 Mercury Montego: common problems
Owners of the 2005 Mercury Montego filed 135 complaints with NHTSA, most often about powertrain and electrical system. Details by component below, with sources.
Key figures
- Owner complaints
- 135
- involving a crash
- 10
What fails most often
- 1 Powertrain 36% of all complaints
- 2 Electrical system 20% of all complaints
- 3 Vehicle speed control 18% of all complaints
- 4 Service brakes 13% of all complaints
- 5 Engine 7% of all complaints
- 6 Structure 7% of all complaints
- 7 Engine and cooling 5% of all complaints
- 8 Fuel system 5% of all complaints
- Powertrain: 49 complaints (36% of all), 3 of them with a crash reported by the owner.
- Electrical system: 27 complaints (20% of all), 1 of them with a crash reported by the owner.
- Vehicle speed control: 24 complaints (18% of all), 2 of them with a crash reported by the owner.
- Service brakes: 18 complaints (13% of all), 2 of them with a crash reported by the owner.
- Engine: 10 complaints (7% of all).
Engines and transmissions
US-market versions per EPA. On the right: how many NHTSA complaints name this engine or transmission type.
- 3 L · petrol · 6 cyl
- automatic, 6-speed
- CVTnamed in 5 complaints
Drive: FWD, AWD
Symptoms owners describe
How many of the 135 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) |
|---|---|---|---|
| Powertrain | 49 | 3 | 0 |
| Electrical system | 27 | 1 | 0 |
| Vehicle speed control | 24 | 2 | 0 |
| Service brakes | 18 | 2 | 0 |
| Engine | 10 | 0 | 0 |
| Structure | 10 | 1 | 0 |
| Engine and cooling | 7 | 0 | 0 |
| Fuel system | 7 | 0 | 0 |
| Air bags | 5 | 3 | 0 |
| Fuel/propulsion system | 5 | 0 | 0 |
| Exterior lighting | 3 | 0 | 0 |
| Latches, locks, linkages | 3 | 0 | 0 |
| Seat belts | 2 | 0 | 0 |
| Visibility | 2 | 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.
While driving approximately 30 mph, the vehicle experienced unintended acceleration and crashed into the rear of a second vehicle. Prior to the failure, the engine rpms erroneously increased and the vehicle surged forward. The front end of the vehicle sustained severe damage, but the air bags did not deploy.
When hitting the brakes my car had a whining noise and accelerated not responding to my efforts to stop.I avoided the cars in front of me and also to the right of me by moving to the turning lane to stop myself from hitting anyone else.
While attempting to depress the brake pedal, the vehicle began to accelerate and the traction control, check transmission, and failed safe mode warning lights illuminated. Due to the failure, the contact crashed into a bush while attempting to park the vehicle. There were no injuries and a police report was not filed.
As he leaned to remove items from the trunk, car rolled backwards and knocked him down, luckily, car was stopped by tree limbs on ravine of tree line, as child rolled down ravine. Resulting injuries were head contusion, concussion and badly bruised arm and back.
We have contact the vehicle manufacture and are awaiting a response from the office of general console for a response of investigation plan of why the airbags did not deploy. I am representing my parent do to my vehicle mechanical background.
While driving down the freeway at about 50 mph I went to accelerate and the transmission sputtered and then tried to downshift but instead locked up and caused the cars front tires to squeal and a rapid slow down. This failure occurs anytime I try to accelerate to pass a vehicle.
My father age 81 was involved in a crash on 1-20-07 in wich he impacted the rear of a semi tractor trailor combo@ approx. 40 mph. The trailor had a bar/bumper extending across the back and down, and the impact was 18-24 inches off the ground.the airbag system did not deploy,resulting in multiple injuries to the head…
Tl* the contact owns a 2005 mercury montego. The contact stated that when the vehicle was started, the front passenger's side door remained open which resulted in a loss of the normal functions of instrument panel due to the passenger's side door ajar message overlaying all other system functions on the instrument…
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 2,869 of 36,656 model years in the NHTSA data (top 8% most complained about).
On average one model year of the Montego has 52 complaints (5 years in the data). This year has 135, above average.
What to check before buying
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Vehicle speed control. Accelerator pedal, cruise control, throttle codes.
- Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
Other years of this model
Questions and answers
What are the most common problems with the 2005 Mercury Montego?
Owner complaints to NHTSA most often mention: powertrain, electrical system, vehicle speed control. Total complaints: 135. The most frequent symptoms in complaint texts: jerking, harsh shifts (20%), warning lights, check engine (16%), knocking, grinding or other noise (7%).
How many service bulletins (TSB) were issued for the 2005 Mercury Montego?
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 Montego 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.