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10.0

really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
137,837 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2005 Mercury Montego engine problems

engine problem

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2005 Mercury Montego Owner Comments (Page 1 of 2)

problem #21

Jun 272013

Montego

  • 270,000 miles

A D V E R T I S E M E N T S

The contact owns a 2005 Mercury Montego. 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. The failure recurred randomly. The vehicle was taken to several independent mechanics, but the cause of the failure could not be determined. The vehicle was not repaired. The manufacturer was notified. The failure mileage was approximately 270,000.

- Bowling Green, KY, USA

problem #20

Apr 052012

Montego

  • 150,000 miles
The contact owns a 2005 Mercury Montego. While driving 15 mph around a corner, the vehicle jerked and the check engine and fail safe mode warning lights illuminated. The vehicle was taken to the dealer where it was diagnosed that the throttle body control unit failed and needed to be replaced. The vehicle was repaired; however, the failure recurred. The manufacturer was notified of the failure. The failure mileage was approximately 150,000.

- Lima, OH, USA

problem #19

Jun 052013

Montego

  • 58,000 miles
When braking it jerks and shifts into neutral and the engine reeves to 5000+ RPM. After braking and slowing it again shifts back into drive. This only happens when braking or increasing speed. No dash lights illuminate, indicating a problem. Having to slow suddenly in traffic is very dangerous. A Ford dealer recommends a new transmission and a transmission shop recommends a new electronic module..this is an intermediate incident problem occurring approximately every two to four weeks..

- Fountain Valley, CA, USA

problem #18

Jan 252014

Montego 6-cyl

  • 80,310 miles

A D V E R T I S E M E N T S

As I was entering onto the highway instead of accelerating the car decelerated and was losing power and RPM's went way too high then it should of. The transmission is not acting properly.the car has a clunking sound when hitting bumps.

- West Bend, WI, USA

problem #17

May 222013

Montego 6-cyl

  • 113,486 miles
As I was going down the highway, the car would suddenly feel as though I had put the gas pedal to the floor. It would suddenly accelerate even though I did not change the pressure on the gas pedal. I took the car to the local dealership and they had an owner notification from Ford to clean the throttle body. The work was completed. However, the problem was never fixed. The vehicle would continue to do this on occasion. Now, the vehicle will completely shut off while I am driving down the highway. The fail safe light will come on and I have to coast to the side of the road. I have taken it back to the Ford dealership and another $1,000 later I am having to replace the throttle body.

- Morehead City, NC, USA

problem #16

Sep 062013

Montego

  • 133,000 miles
I was in the meddle lane of a four lane highway when I lost all my acceleration. The motor was still running but I could not go anywhere. When I got off the highway I restarted the car but every few miles it would do the same thing. Am told that it is a bad throttle body and Ford has known about it for years but is not doing anything about it. It is going to get people killed ! my part cost over $600 so it sets in the drive.

- Mansfield, OH, USA

problem #15

Jul 142013

Montego

  • 70,000 miles

A D V E R T I S E M E N T S

The contact owns a 2005 Mercury Montego. The contact stated that while driving approximately 70 mph and merging into the left lane, there was no response from the vehicle upon engaging the accelerator pedal. In addition, the vehicle jerked violently. The vehicle began to accelerate normally several seconds later. The vehicle was taken to an authorized dealer where the throttle body was being replaced. The manufacturer was not notified of the problem. The approximate failure mileage was 70,000.

- Waynesboro, VA, USA

problem #14

Mar 012011

Montego

  • 50,000 miles
The contact owns a 2005 Mercury Montego. The contact stated that after shifting into gear, the vehicle lunged forward abnormally. The vehicle was taken to the dealer who was unable to diagnose the failure. The manufacturer was not made aware of the failure. The vehicle was not repaired and the VIN was not available. The failure mileage was 50,000 and the current mileage was 86,087.

- Eunice, LA, USA

problem #13

Aug 202011

Montego 6-cyl

  • 108,000 miles
We own a 2005 Mercury Montego premier. Over the past several months have noticed alternate stalling or random accelerating however on Saturday, as I was accelerating the vehicle suddenly stalled & refused to go over 1,000 rpms. We took the vehicle to a local repair shop who performed a diagnostic which located the failure at the throttle body. Car is currently @ local repair shop, estimate of $850 to repair.

- Satsuma, FL, USA

problem #12

Aug 042011

Montego 6-cyl

  • 73,000 miles
When accelerating the vehicle would be rough and inconsistent almost lurching forward at times. The vehicle would do this every time it was driven. After having to replace the vehicles battery the vehicle would not accelerate at all. The rpms would not go above 1000. The throttle body was replaced and now the vehicle drives fine. I do still have the old part.

- Spring Hill, FL, USA

problem #11

Aug 112011

Montego

  • 95,275 miles

A D V E R T I S E M E N T S

The contact owns a 2005 Mercury Montego. The contact stated that while driving 30 mph, the entire electrical system malfunctioned and caused the rear brakes and instrument cluster to fail. The vehicle was taken to an authorized dealer, where a diagnostic test indicated that the throttle body and alternator were faulty. The dealer replaced the throttle body, but not the alternator. The failure continued. The vehicle was taken back to the authorized dealer, where they were unable to diagnose the failure. The failure mileage was 95,275.

- El Paso, TX, USA

problem #10

Jul 022011

Montego

  • 130,500 miles
The contact owns a 2005 Mercury Montego. The contact stated while driving the vehicle suddenly accelerated, the message ( engine failed safe mode ) illuminated on the instrument panel which caused the vehicle to stall. The vehicle was taken to the dealer who diagnosed that the throttle body and the alternator needed to be replaced. The manufacturer was made aware of the failure and referred him to NHTSA. The vehicle was not repaired. The failure mileage was 130,500 and current mileage was 130,520.

- Bascom , OH, USA

problem #9

Jun 012011

Montego

  • miles
Engine revs up, and car lurches, typically when: - shifting into drive or reverse and/or moving away from idle; - almost always when the wheels are cranked all the way to the left or right and the car is moving away from idle. The lurching is sudden and "violent" enough that it can catch a driver unprepared - my wife and I are used to it and able to compensate, but we aren't letting our 17 year-old drive the car for now unless one of us is with her. Ongoing problem since car was purchased new. This has been an occasional problem for years - complaint was even made while car was still under its 3 year/36,000 mile warranty (nothing found). Problem has been getting more frequent over the past year or so.

- Milwaukee, WI, USA

problem #8

Jun 282010

Montego

  • 86,000 miles
The contact owns a 2005 Mercury Montego premier. The contact stated that the vehicle suddenly accelerated numerous times, would lose power and stall. The vehicle was taken to the dealer who performed a diagnostic which located the failure at the throttle body sensor. The throttle body sensor was not replaced. The manufacturer advised the contact that the failure was not recalled. The vehicle was not repaired. The failure mileage was 86,000 and the current mileage was 100,000.

- Lake Waccamaw, NC, USA

problem #7

Jun 242011

Montego

  • 1,008,000 miles
I have a 05 Montego I brought used last year it wants to go by itself when U start to leave I almost hit a person while in drive thru last week this is scary does someone have to dye or get hurt before a recall was told it the throttle body sensor really expensive to fix and not sure which one theirs two im told.

- Lake Waccamaw , NC, USA

problem #6

Jul 262010

Montego

  • 77,000 miles
The contact owns a 2005 Mercury Montego. The contact stated that while driving, the vehicle began to jerk and knock and when she depressed the accelerator pedal, the speed would not increase. Also when she attempted to brake, the vehicle would not slow down and at times would actually speed up. The contact called the manufacturer who stated that the throttle body and transmission had to be replaced at her expense. The vehicle had not been repaired. The current and failure mileages were approximately 77,000.

- Belleview , NE, USA

problem #5

Sep 232010

Montego 6-cyl

  • 79,000 miles
My 2005 Mercury Montego (79,000mi.) has unexpectedly lurched on two occasions. The first time I was driving slowly in a parking lot, and the car suddenly accelerated and lunged forward. Braking helped, but the lunging occurred again each time I tried to drive forward. I was able to move into a parking space and turn the car off which stopped the lurching movement. I sat for several minutes, restarted the car and drove away without incident. This didn't happen again for several months until a similar occurrence yesterday. This time I was ready to back out af a parking space, put the car in reverse and it surged backward. I depressed the brake, put the car in park, and shut it off. Once again I waited several minutes and drove away without incident. This is a very dangerous situation as people could have been close to the car when it lunged, or I could have been in traffic. I consider this to be a serious safety issue. With both of these occurrences the " fail safe mode" message appeared.

- Mechanicsburg, PA, USA

problem #4

Jul 262010

Montego

  • 178,000 miles
The contact owns a 2005 Mercury Montego. The contact stated while driving at approximately 65 mph, the vehicle independently shifted into failsafe engine mode. There was also an unusual increase in engine rpms. The contact shut off the vehicle and when restarting, the warning light was no longer illuminated and the vehicle resumed normal operation. The dealer advised that the failure was potentially caused by debris and should have corrected itself. The contact was advised not to bring the vehicle in. The failure recurred within three days. The vehicle was taken to a local repair facility where the contact was advised that the throttle body was defective and recommended a fuel injection service. The vehicle was taken to the dealer where repairs were made. The manufacturer was not contacted. The failure mileage was approximately 178,000 and the current mileage was approximately 179,000.

- Mechanicsville, VA, USA

problem #3

Oct 202009

Montego

  • 51,000 miles
The contact owns a 2005 Mercury Montego. The contact was driving at speeds of 20 mph. When they attempted to pass another vehicle, she depressed the accelerator and the vehicle was hesitant to increase speed similar to driving while in neutral. In addition, when depressing the brake pedal, the vehicle would jerk abnormally. The dealer reset the vehicle computer system and the vehicle returned to normal operation for a short period; however, the failure recurred. The contact had not taken the vehicle back to the dealer. The failure mileage was 51,000 and the current mileage was 64,000.

- Pascagoula, MS, USA

problem #2

Jan 032010

Montego

  • 27,000 miles
While idling when stopped or when moving slowly, the engine speed suddenly accelerates to above 3500 RPM causing the car to lurch forward unless the brake is firmly applied. The sudden acceleration lasts 3 to 5 seconds. Placing the gear into neutral has no effect on the engine speed. This happens sporadically. In the last 3 months it has happened approximately 7 times. Dealer says the car's computer system reports nothing unusual.

- Viera, FL, USA

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