Huge win for car owners! All TSBs to be made public. The Center for Auto Safety just made the NHTSA (US Government) make public the full text of all TSBs from now on. They are the same organization that has petitioned the NHTSA & filed lawsuits to protect car owners over exploding gas tanks & other major safety issues. Whenever you drive in your car, you are safer thanks in part to a lot of work over the years by this small but very effective consumer advocacy group.

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really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
1 / 0
Average Mileage:
42,690 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.

2011 Mercury Mariner engine problems

engine problem

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2011 Mercury Mariner Owner Comments

problem #15

Dec 132014

Mariner 4-cyl

  • 37,900 miles


Driving at 40 mph car stalls, pull over, car starts up engine lite on, (sat) take to dealer on mon (12/15/2014), explain to dealer, they call 3 hours later to say "purge valve needs to be replaced"ok this should be covered right? she says no! the cost to you will be $320.33. I told her this is part of the emissions, it has to be, she said no its not! I purchased this car from this dealer 3 1/2 years ago, (bought is new) still underwarranty.. but this is not covered! the 800 number to Ford blew me off! and said what the dealer says goes!>. why did she suggest I call them then! (not good customer service) I was hoping for explanation! please help, this should be covered. Look at your on line complaints about this! shame shame shame. Of course I paid it, I need my car! please note I was told that there were at 5 or more cars with the same/similar problem.

- Allen Park, MI, USA

problem #14

Jun 242014

Mariner 6-cyl

  • 60,000 miles
I was driving down the highway on my afternoon commute home with my 3 yr old daughter in the back seat and my vehicle lost power and the check engine light and a wrench light came on and it would not go above 25 mph. I almost got hit in the rear of my vehicle cause I was not expecting this to happen by any means, but I was able to coast off the highway and shut the engine down for a few minutes and restarted it drove about 5 miles and it did it again.

- Fort Wainwright, AK, USA

problem #13

Dec 072013


  • 53,000 miles
Driving down a highway at 60mph the 2011 Mercury Mariner stopped accelerating. Pulled over to the side of the road. Waited 3 seconds and restarted the car. It hesitated to turn over but did restart.

- Fort Rucker, AL, USA

problem #12

Sep 172013

Mariner 4-cyl

  • 39,400 miles


She pulled into a patients driveway and stopped she went to put it in park and the car just took off into the house. She (the driver) had to be taken to the er. She had her foot on the brake still when the car took off. I have pictures of how the right front tire was dragged through the dirt while brake was applied. It damaged the home and did over $5000 damage to the car. She insists it accelerated unexpectedly.

- New Castle, PA, USA

problem #11

Sep 112013

Mariner 6-cyl

  • 49,000 miles
Traveling on 2 lane road at 55 mph. Engine set at cruise control speed when power was lost. Vehicle felt like it was coasting, the accelerator would not work. I was able to coast to a stop on a side street, then had my vehicle towed to the dealer for repairs. I checked web sites last night and found this to be a recurring problem with Ford escapes and Mariners. Cost of repair was $382.37 and not covered for any reimbursement by Ford/Lincoln. Cutting off like this is extremely dangerous and places occupants at risk for serious injury.

- Lexington, NC, USA

problem #10

Jun 082011


  • 20,000 miles
The contact owns a 2011 Mercury Mariner. The contact stated that while driving at various speeds, the vehicle would shake violently. The contact mentioned that the most recent time the failure occurred, the vehicle decelerated independently and without warning. The vehicle was towed to the dealer. The technician diagnosed that the throttle body was defective and needed to be replaced. The manufacturer was made aware of the failure. The vehicle was repaired. The failure mileage was 20,000 and the current mileage was 58,000.

- Weaverville, NC, USA

problem #9

Aug 132013


  • 45,500 miles


While driving down the highway, in my 2011 Mariner it suddenly lost the power to accelerate (engine still running). The wrench light illuminated at this time. Pressing on the accelerator did nothing. Fortunately there was nothing behind me so I coasted about 1/4 mile to the next turn off and coasted off the highway. Then I turned the vehicle off, waited a few minutes and restarted it. I drove about 20 miles home with no other occurrence. The next day (August 14, 2013) I drove about 20 miles to work with no problems. That afternoon I left work and drove about 2 miles at 25 mph and it lost all acceleration power again (motor still running). I turned it off and restarted it. I drove another 2 miles at 25 mph and it lost acceleration power again, but this time both the wrench light and the check engine light came on (engine still running). I then drove directly to my Ford/Mercury dealer (about 1 mile) and told him the situation. It is currently in their shop and I haven't heard back from them yet. They gave me a loaner vehicle to drive while they check out my Mariner. -- extremely scary situation! if this happens to me on an interstate in a center lane with heavy traffic will be life threatening. I don't want to be afraid driving my vehicle and think a recall should be done asap!! today I have read other similar situations people have experienced with Mariners and escapes. Please check into this asap before there is a tragedy if there hasn't already been one gone unreported!!! thank you!!

- Melrose, IA, USA

problem #8

Jul 252013

Mariner 6-cyl

  • 69,000 miles
As I was driving my 2011 Mercury Mariner it suddenly lost the power to accelerate (engine still running). The wrench light illuminates at this time. I could not do anything to increase speed (pressing on the accelerator did nothing). The only fix is to shut down the engine and re-start. The mileage is 69, xxx. This first occurrence happened on 7/25/2013, however, the same symptoms have occurred randomly several times since that time. I explained the symptoms to my local Ford dealer service department and indications are a defective throttle body.

- Chestefield, MO, USA

problem #7

Jul 142013

Mariner 6-cyl

  • 40,876 miles
I was on onramp, vehicle slowed down, wrench light lit up on dashboard. Vehicle would not accelerate. I pulled to the side of the highway and restarted vehicle. Vehicle continued to do this for the duration of our trip.

- Ore City, TX, USA

problem #6

Jul 172013


  • 41,926 miles
The contact owns a 2011 Mercury Mariner. The contact stated that while exiting the highway ramp at approximately 30 mph, the vehicle lost acceleration then the mil and check engine warning lights illuminated. The contact performed a diagnostic which located the failure at the throttle. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure and current mileage was 41,926.

- Ellwood City , PA, USA

problem #5

Jul 042013

Mariner 6-cyl

  • 47,000 miles

A D V E R T I S E M E N T S - read comments on this site. Exactly what our Mariner is doing. 60 to zero in 2 seconds. Yellow wrench light comes on, vehicle no longer accelerates, pullover, turn off, restart. Has happened 3 times.

- Pegram, TN, USA

problem #4

Jun 272011


  • 43,000 miles
Defective throttle body.

- Florisaant, MO, USA

problem #3

Jun 072013

Mariner 6-cyl

  • 38,000 miles
Vehicle traveling at 70 mph on interstate engine quit and loss of steering and control. Pulled over re started happened again. And engine light went on. Re started drove to dealer later and discovered after $100 diagnostic that the throttle body was not working properly. Happened when mileage was between 38-39000. They wanted me to pay over $590 to replace their defective part at Ford dealership they refused to put it under any warranty or recall. I did not have it fixed. It is a danger to allow this matter not to be recalled as it has happened thousands of times in many Ford vehicles.

- Ocala, FL, USA

problem #2

Feb 232013

Mariner 6-cyl

  • 37,755 miles
The contact owns a 2011 Mercury Mariner. The contact stated that while driving approximately 30 mph, the rpms increased as the vehicle independently decelerated. The contact shut the engine off and restarted the vehicle. The failure continued intermittently. The vehicle was taken to the dealer for diagnosis. The technician stated the throttle body would have to be replaced. The vehicle was not repaired. The approximate failure mileage was 37,755.

- Fruitland Park, FL, USA

problem #1

Jan 012011


  • 18,000 miles
The contact owns a 2011 Mercury Mariner. The contact stated that while driving at various speeds, the vehicle would stall without warning. The vehicle would sporadically hesitate when accelerating with the immediate illumination of the transmission warning light. The vehicle was later towed to the dealer where the contact was advised that fuel emission and the throttle body would require reprogramming. The vehicle was repairer however, the failure recurred. The manufacturer was contacted and offered no assistance. The failure mileage was approximately 18,000. The current mileage was approximately 40,000.

- Huntsville, AL, USA

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