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.

Please take a moment & say thank you by donating $5 or whatever you can to the Center for Auto Safety.


hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
68,079 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.

2009 Mercury Mariner fuel system problems

fuel system problem

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2009 Mercury Mariner Owner Comments

problem #14

Oct 172013

Mariner 6-cyl Diesel

  • 117,605 miles


Driving home from work the car went into "limp mode", pulled over to side of road, called for tow and had car taken to shop for diagnostics and repair. Shop determined it was faulty throttle body ( there were over 700,000 orders for replacements on website at this time)part was on backorder---came in, was replaced and I paid the bill of $720.60 for parts, labor, towing and taxes. I got letter from Ford that part is now a recall item so I take the bill to kerry Ford in cincinnati, oh and they take all of my info and send me a check for $167.85 and tell me too bad for not having work done at Ford store, that's all I am going to get. This does not even cover the cost of the part alone. So as a stranded motorist, I was supposed to think of a Ford dealership first instead of safety first and getting my car repaired.

- Lawrenceburg, IN, USA

problem #13

Dec 312013

Mariner 4-cyl

  • 70,000 miles
Car engine stopped while driving at a low (10-20 mph) speed. Second time this happened. First time on 2011 replaced throttle body then. It happened again 12/31/2013. Ford service said throttle body needs to be replaced again.

- Irvington, NY, USA

problem #12

Dec 262013

Mariner 4-cyl

  • 94,000 miles
While driving the Mariner at 45 mph on a busy street, the engine went into limp mode, lost all acceleration and slowed to 5 mph. I was nearly rear-ended by the truck behind me and was forced to pull up onto a sidewalk, damaging my tire. Pulled the codes on the car and got a P111 code. Did some searching on the internet and found that this is a common issue and an extreme safety hazard. I was very happy that I was the driver, and not my 16 year old daughter!!! this is the second safety issue we have had with this car in the last month -- earlier the power steering went out, again without any warning in traffic.

- Ocala, FL, USA

problem #11

Sep 182013

Mariner 4-cyl

  • 60,000 miles


Driving 30mph car begins to surge and slow down had to pull over to road shoulder. Fuel gauge shows empty when there is a full tank. Cut the engine off for five minutes, start engine tried to drive the car is still surging and slowing down, then starts to run normally. This is the second occurrence the first occurred in March of 2013.

- Warrior, AL, USA

problem #10

Aug 082013

Mariner 4WD 6-cyl

  • 74,000 miles
The vehicle has stalled while in motion 6 times now, while stopped 3 times. Stalled once while driving upwards of 40 mph. I had to stop in the middle of the street, put emergency blinkers on, and restart the car. Vehicle seems to spontaneously falter in acceleration and loses power. Turning off ignition and restarting engine fixes the problem but it will then reoccur at an unknown time. Some incidences have been in the same day, others have been up to a week apart.

- Long Beach, CA, USA

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problem #9

Sep 052013


  • 101,000 miles
While driving approximately 35 mph, the vehicle lost all throttle. The engine continued to run. Pulled over and placed the vehicle in park. Pressed on accelerator but nothing happened. It would not rev the engine. Restarted the vehicle and the throttle worked properly. This happened twice today.

- Crown Point, IN, USA

problem #8

Aug 262013

Mariner 6-cyl

  • 90,000 miles


2009 Mercury Mariner with about 90,000 miles. Was on the freeway driving about 65-70 mph when suddenly the power to car cut off - was not able to accelerate vehicle; drove to right side of the road. Car was still on, but gas pedal would not work, wrench light was on, car idling very roughly. Turned car off. Turned car back on, wrench light was off, drove another 30 minutes to destination without incident. In the two hour drive home, the car cut off five more times. I heard a bell alert audio sound a few times, but the only light that came on was the wrench just as the power cut off. The very last time it happened, the engine light came on, and stayed on even after restarting the car. I feel very thankful to have got home alive and without getting into an accident. Dealer recommends a 90M service package ($547), a diagnostic test ($104), and possibly a throttle body and/or sensor ($300-ish).

- Charlotte, NC, USA

problem #7

Jul 022013

Mariner 6-cyl

  • 65,000 miles
Recently purchased 2009 Mercury Mariner (Ford escape) has three times simply quit while driving at low speed and the throttle is gently pressed. Latest incident was while traveling uphill with two grandchildren and a 18 wheel truck on the back bumper. Luckily my wife had the presence of mind to shift to neutral, re-start the engine, and accelerate away from the truck. No error codes have been set during these three events.

- La Conner, WA, USA

problem #6

Aug 082013

Mariner 6-cyl

  • 45,300 miles
Driving along and unexpectedly engine goes in limp mode with no warning and no acceleration- extremely dangerous as was driving on expressway when this occurred.

- Philadelphia, PA, USA

problem #5

Jul 262013

Mariner 6-cyl

  • 54,000 miles
Driving at highway speeds when the vehicle lost all power. Was able to the vehicles momentum to pull to the side of the highway. After turning the car off, waiting, restarting the vehicle, I was able to restore power to the engine to return home. Turning left through cross traffic, the vehicle lost power again. Was able to quickly turn the vehicle off then on again to restore power and move out of the way of oncoming traffic. The dealer diagnosed and replaced the throttle body for being defective. The vehicle is no longer under warranty and I was required to pay. This is the second time this problem has happened. 1.5 years ago the same problem happened and the throttle body was replaced under warranty.

- Austin, TX, USA

problem #4

Jun 112013

Mariner 6-cyl

  • 92,000 miles


On June 11th, 2013, I was turning a corner and my vehicle was not allow me to accelerate. I was able to pull over to the side of the road and turn the vehicle off. I sat with the vehicle off for about five minutes and was able to start it back up. I then drove a few feet, and it stalled again. I then turned it back off and let it sit for a few more minutes, in which I was able to restart it and drive home. He same problem has occurred at least 5-10 more times since then. Since then I have had the throttle body cleaned, put the issue still exist. The most recent occurrence was this morning at 10: 30 am. I contacted after-market auto part stores and they do not carry a throttle position sensor. I contacted the local Ford dealership and they told me that the part was on back order and it would take some time to get the part in.

- Kent, OH, USA

problem #3

Apr 032012


  • 35,400 miles
Was driving down country road and all of a sudden felt then engine what I thought was kick out of gear. Had no acceleration at all. Pulled off road and the vehicle was running in a rough idle, but still could not give it gas. Once placed in park the idle leveled out and still no acceleration. The wrench symbol was on. I stopped the engine and waited 10 minutes then restarted engine and everything was ok. For about 3 months. I took into the Ford dealer only to be told there was no code and they could do nothing without it. Problem has gotten steadily worst. And now it is at point where wife can not drive her car! I am driving it and finally yesterday the engine light came on. I ran it to autozone where they confirmed the dreaded P2112 code. I took it to the Ford dealer today figuring alright less than 5 years old and 42,000 miles I would finally get it fixed. No go! although for $106 they did confirm what autozone already told me that the throttle-body was shot and would cost another $430 to fix.I promptly called Ford customer care line and was told that they would contact the service manager at my Ford dealership to work out a payment plan for me to get it fixed still at my cost. This is crazy that I payed over 26,000 for a vehicle that I still owe 11,000 on and under 5 years old with 42,000 miles and this is my 3rd major problem with it.. have already had the engine pulled apart once to be fixed and one of the drive shafts had to be fully replaced. This is unfortunate but will be the last Ford I ever own!!!

- Elgin, SC, USA

problem #2

Jun 182012

Mariner 6-cyl

  • 46,000 miles
When being aggressive with the accelerator the engine stalls and the accelerator stops working forcing the driver to pull off of the road. When bring the car to a stop it jerks forward until it is put into park, still the accelerator does not work no matter how pushed. After turning it off start up takes longer than usual and either the little wrench or the engine symbol appears. After taking it to a mechanic it is diagnosed that is has a bad electronic throttle and it will have to be replace. Prior to this there has not had an accident, instance or work done that would cause this.

- Ponte Vedra Beach, FL, USA

problem #1

Nov 102009


  • 8,800 miles
Ford Motor Co. Produced 2009 & 2010 Mercury Mariner vehicles' fuel system leaks gas when attempting to top off the gas tank. All Ford vehicles produced over the past two years may be affected. Ford will not fix the problem and tells the customer to not top off the gas tank although nothing is included in the owner's manual about this nor are dealerships admitting any knowledge about the problem nor has Ford sent any service bulletins to affected dealerships. All of the above has been confirmed on at least two occasions by my servicing Ford dealership.

- Tucson, AZ, USA

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