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Mercury MarinerModel year report

2011 Mercury Mariner Problems

Compared with other Mercury Mariner years

Typical for this model

51/100 1.0× a typical year · 50 = typical

Nearby years with a typical complaint level and no open NHTSA investigation: 2009, 2010

Based only on NHTSA complaints, recalls and investigations. Not adjusted for how many vehicles were sold, and not a reliability rating. How this is calculated

Complaints
87filed with NHTSA
Median mileage
52,440miles, 68 complaints with mileage
Recalls
2campaigns on record
Trend
FallingComplaints filed in the last 3 full calendar years are at least 25% lower than in the 3 years before.
NHTSA crash rating
3 / 5stars overall, 4 rated versions
EPA fuel economy
23 mpgcombined, 2.5L 4-cyl FWD · 21 city / 27 hwy

Sources: NHTSA records for the 2011 Mercury Mariner (complaints, recalls, investigations), NHTSA crash tests, EPA fuel economy. Report an error

What owners report

Owners of this model year most often describe the engine dropping into a reduced-power mode: the accelerator stops responding, a wrench light comes on, and power returns after the vehicle is shut off and restarted. Many of these complaints arrive at low to moderate mileage, and a separate, larger-mileage group concerns loss of power steering assist. Transmission and fuel-system complaints are also common in the underlying data.

  1. Vehicle speed control

    Sudden loss of acceleration with wrench light (throttle

    • 37 complaints (43%)
    • median 46,550 mi at 2.9 yrs old (36 state mileage)
    • 1 mention a crash, fire or injury
    • owner-quoted repair $480 (median of 6 quotes)
    • filed 2012–2023

    Drivers describe the vehicle abruptly losing power while the engine keeps running: the accelerator does nothing, speed drops to roughly 20-40 mph or lower, and a wrench or check engine light appears. In many cases shutting the engine off and restarting restores normal operation until it happens again. Complaints say dealers diagnosed a throttle body fault or stored code P2111 (throttle actuator stuck open), and several owners report the repair was quoted at a few hundred dollars and not covered under warranty. Mostly reported between about 18,000 and 70,000 miles, often at highway speeds or when pulling away from a stop.

    3 related service bulletins

    What to check: Ask whether the electronic throttle body has been replaced and whether any related codes were stored. On a test drive, watch for hesitation, a wrench light, or a throttle that feels unresponsive.

    2 excerpts from owner complaints in NHTSA records

    “The vehicle lost all power from the motor and I had to cross lanes to get to the shoulder while free wheeling. This has now happened on 3 occasions. The motor was still running but with no pulling power. Once I had switched the motor off and waited a few moments I was able to restart and the vehicle operated perfectly.”

    NHTSA complaint #10559592, filed 2014-01, 38,000 miles

    “On the morning of september 10, 2013, after about a 30 minute commute to my place of work, I pulled into my work driveway, and my 2011 Mercury Mariner stalled. The engine seemed to cut off, the wrench light came on, and my vehicle rolled into the parking spot. Unsure of what had happened with my vehicle (as it had never happened before), I immediately called my local ford dealership service department. …”

    NHTSA complaint #10546331, filed 2013-09, 60,884 miles
  2. Steering

    Power steering assist cuts out (torque sensor / column)

    • 19 complaints (22%)
    • median 129,000 mi at 7.5 yrs old (17 state mileage)
    • filed 2015–2026

    Owners describe the steering suddenly becoming very heavy, sometimes with the power steering warning light and sometimes with no warning at all; a few say the wheel effectively locked. Several complaints state a dealer or independent shop traced it to the steering torque sensor or the steering column, and some owners note the problem returned even after the vehicle had been repaired under the power steering recall. Mostly reported above 90,000 miles, frequently past 120,000, and often while turning at low speed.

    Recall 14V2840001 related service bulletin

    What to check: Confirm whether recall 14V284000 was performed and whether the torque sensor or column was replaced afterward. Turn the wheel from lock to lock at idle and feel for heaviness or intermittent assist.

    2 excerpts from owner complaints in NHTSA records

    “I went to my mechanic with a steering problem, and it was part of the torque sensor issues that was recalled. My car falls in those dates but there is no recall on my VIN for that part. And I don't get why.”

    NHTSA complaint #10700846, filed 2015-03, 103,000 miles

    “Ford has not fixed the issue! Vehicle was taken in do you do recall my previous owner and only software was updated pertaining to the power steering recall. It is not a software update issue. The torque sensor must be replaced. Ford will not cover nor reimburse this issue. Many other customers are having this exact same problem. The power steering assist goes out without warning and makes the vehicle very dangerous to drive. I was driving my vehicle this morning and out of nowhere the turning became very difficult.”

    NHTSA complaint #11082509, filed 2018-04, 71,000 miles
  3. Fuel system

    Stall or rough running tied to purge valve / fuel system

    Mentioned in 5 of 60 sampled complaints

    Some complaints describe stalling at speed or a hard start and rough idle after refueling, with the check engine light on. Owners say dealers replaced or reprogrammed the canister purge valve and, in some cases, updated the fuel emission and throttle software; several report the symptom returned afterward. Reported from under 20,000 miles up to about 60,000 miles, in varied driving conditions.

    Recall 16V7770003 related service bulletins

    What to check: Ask whether the purge valve or fuel emission software updates were done. Check for a fuel smell and watch for a hard start right after filling the tank.

    2 excerpts from owner complaints in NHTSA records

    “Started vehicle in the morning for work & yellow wrench light came on, combined with limp mode symptoms of no throttle response. Googled & found multiple complaints for similar issues with this motor. Called local ford dealer who said the throttle body has had 3 different part numbers which leads me to believe that this has been a know issue for a while now. Ordered the latest version of the throttle body & will have it replaced by my mechanic who said its a 1/2 hr install. …”

    NHTSA complaint #10521672, filed 2013-06, 27,000 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 fords blew me off! And said what the dealer says goes!>. …”

    NHTSA complaint #10664424, filed 2014-12, 37,900 miles
  4. Transmission and drivetrain

    Transmission fluid leak at left halfshaft seal

    Mentioned in 4 of 60 sampled complaints

    Complaints and service bulletins describe fluid weeping from the left-hand halfshaft seal area of the automatic transmission, with wear at the case bushing cited as a cause. Owners mainly notice spots under the vehicle or a fluid smell rather than a drivability change. Typically noted on higher-mileage vehicles; sample reports cluster from about 45,000 miles upward.

    5 related service bulletins

    What to check: Look for reddish fluid at the left side of the transmission where the halfshaft enters, and check the fluid level and condition on a test drive.

    2 excerpts from owner complaints in NHTSA records

    “While cruising on I-40 headed towards nashville, my car went into an idle state and I forced to the side of the road to turn off the car. Turned it back on and it ran for another 25 miles and did the exact same thing. I took it to the ford dealer where they looked for any codes. The code that they found was p2111 for a powertrain throttle body. None of these parts are in stock anywhere in tenn from what the tech said. …”

    NHTSA complaint #10533759, filed 2013-08, 63,719 miles

    “Wrench light on Mercury Mariner 2011 with slow (20-40mph max) and rough ride home. Yesterday while leaving work, I turned right out of the parking lot onto the main road. Immediately my Mariner hesitated, jerked forward, and a wrench light came on. My SUV slowly accelerated to 20mph and struggled to get to 40mph. It road rough and I wasn't sure if it would stall or not; however, I was able to slowly make it home. I looked up the wrench light and learned I was likely having a throttle body or powertrain problem. …”

    NHTSA complaint #10910244, filed 2016-09, 90,000 miles

Buying note. Have a pre-purchase inspection check the throttle body behavior, the power steering assist and whether recall 14V284000 was completed, plus the transmission seal area and the rear hatch glass. Records showing recent throttle body or purge valve work are worth asking about.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.

NHTSA recorded 87 consumer complaints for the 2011 Mercury Mariner. 68 of the complaints include a mileage, and 47% of those were filed for vehicles with under 50,000 miles; the median is 52,440 miles. Of all complaints, 2 involved a crash, 1 an injury, according to the filers. NHTSA lists 2 recall campaigns and 27 technical service bulletins for this model year. Compared with the other 3 Mercury Mariner model years that have at least 25 complaints and are old enough to compare, this one scores 51 out of 100, where 50 is a typical year for the model (typical for this model). The comparison allows for the era and for how long each year has had to collect complaints, but not for how many vehicles were sold.

Which parts are reported most

Complaints can name more than one part, so the counts add up to more than the total. Select a part to see its complaints, recalls and bulletins.

Also reported: Equipment (1), Suspension (1).

Example complaints

Fuel system: “The throttle is not working right. I was almost in 2 accidents because of this. I step on the gas and nothing happens. I hear that 1000s are having the same problem but no recall. This is very dangerous when in a 75 MPH zone and suddenly no power.”

NHTSA complaint #10938982, filed 2017-01, 32,012 miles

Transmission and drivetrain: “I was driving about 60 miles an hour on an expressway when the throttle control/powertrain indicator light came on and I could no longer accelerate the vehicle. As I pulled over to stop, the vehicle lurched forward multiple times before I was able to shut the engine off.”

NHTSA complaint #10919251, filed 2016-10, 63,000 miles

Steering: “I'm very upset and on the verge of tears! My steering wheel suddenly locked on me! I almost wrecked! This has happened a few times & I have no warning light on my dashboard”

NHTSA complaint #11384878, filed 2020-12, 125,000 miles

Vehicle speed control: “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.”

NHTSA complaint #10606077, filed 2014-06, 60,000 miles

Mileage when problems were reported

47% of the 68 complaints with a mileage were filed for vehicles with under 50,000 miles; the middle half falls between 41,750 and 102,000 miles.

3%0–106%10–2538%25–5022%50–754%75–10021%100–1506%150+
Share of complaints by mileage when the problem was reported, in thousands of miles (68 complaints with mileage). Red bars: under 50,000 miles. Bucket widths differ. Median: 52,440 miles.

Complaints by year filed

Trend: falling. Complaints filed in the last 3 full calendar years are at least 25% lower than in the 3 years before.

’11’1330’15’17’19’21’23’26
Complaints by year the complaint was filed with NHTSA. Red bars: the last 3 full calendar years used for the trend. The current year (2026) is partial.

Crash test ratings

NHTSA's 5-Star Safety Ratings for the 2011 Mercury Mariner. Frontal results are shown driver / passenger; rollover shows the star rating and NHTSA's estimated risk of rolling over in a single-vehicle crash.

VersionOverallFrontalSideSide poleRollover
Mariner · 4dr suv 4x2★★★☆☆2 / 4343 · 23.7% risk
Mariner · 4dr suv 4x4★★★☆☆2 / 4343 · 20.4% risk
Mariner HEV · 4dr suv 4x2★★★☆☆2 / 4343 · 23.7% risk
Mariner HEV · 4dr suv 4x4★★★☆☆2 / 4343 · 20.4% risk

Source: NHTSA New Car Assessment Program (5-Star Safety Ratings), nhtsa.gov/ratings.

Fuel economy and running cost

EPA ratings for each 2011 Mercury Mariner version. Annual fuel cost is the EPA's estimate at its current fuel prices for 15,000 miles a year (55% city driving).

VersionEngineTransmissionCityHwyComb.Fuel / yr
Mariner 4WD2.5L 4-cyl6-speed automatic202622$3,050
Mariner FWD2.5L 4-cyl6-speed automatic212723$2,900
Mariner 4WD FFV3.0L 6-cyl · flex-fuel6-speed automatic182320$3,350
Mariner FWD FFV3.0L 6-cyl · flex-fuel6-speed automatic192521$3,200
Mariner Hybrid 4WD2.5L 4-cyl · hybridCVT302729$2,300
Mariner Hybrid FWD2.5L 4-cyl · hybridCVT343032$2,100

Source: U.S. EPA and Department of Energy, fueleconomy.gov. Ratings are for comparing vehicles; real-world mileage varies with driving and conditions.

Recalls and investigations

Recall details for the 2011 Mercury Mariner → · Check a VIN at nhtsa.gov/recalls

Technical service bulletins

TSBs are manufacturer notes to dealers about known repair procedures. They are not recalls and do not by themselves mean a vehicle has a fault. 27 on record; the latest 10 are shown.

See all 27 bulletins →

Other model years of the Mercury Mariner

YearComplaintsMedian miRecallsCrash ★MPGScore (50 = typical)Trend
20118752,440232351 · TypicalFalling
201027061,1002—2349 · TypicalFalling
200931597,0001—2348 · TypicalFalling
2008461106,0003—2272 · MoreFalling
20073377,5002—21Not compared (before 2008)Falling
20066382,0003—21Not compared (before 2008)Falling
20056760,0682—21Not compared (before 2008)Falling

All Mercury Mariner model years · Best and worst years by complaints

Frequently asked questions

What are the most common problems with the 2011 Mercury Mariner?

Owners of this model year most often describe the engine dropping into a reduced-power mode: the accelerator stops responding, a wrench light comes on, and power returns after the vehicle is shut off and restarted. The issues reported most often: Sudden loss of acceleration with wrench light (throttle; Power steering assist cuts out (torque sensor / column); Stall or rough running tied to purge valve / fuel system.

How many NHTSA complaints does the 2011 Mercury Mariner have?

NHTSA recorded 87 consumer complaints for the 2011 Mercury Mariner as of Oct 28, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

What part of the 2011 Mercury Mariner is reported most often?

Fuel system is named most often, in 28 complaints (32% of the total), followed by transmission and drivetrain with 24.

Has the 2011 Mercury Mariner been recalled?

NHTSA lists 2 recall campaigns for this model year. To check a specific vehicle, enter its VIN at nhtsa.gov/recalls.

How did the 2011 Mercury Mariner do in NHTSA crash tests?

NHTSA's 5-Star Safety Ratings give the 2011 Mercury Mariner 3 out of 5 stars overall, across 4 rated versions (body style and drive). Ratings from different model years are only comparable when the vehicle was not redesigned in between.

What gas mileage does the 2011 Mercury Mariner get?

The EPA rates the 2011 Mercury Mariner (Mariner FWD, 2.5L 4-cyl) at 23 mpg combined, 21 city and 27 highway, with an estimated annual fuel cost of $2,900 at 15,000 miles a year. Other engine and drive versions are rated differently.

At what mileage are problems with the 2011 Mercury Mariner reported?

Among the 68 complaints that include a mileage, the median is 52,440 miles and the middle half falls between 41,750 and 102,000 miles; 47% were filed for vehicles with under 50,000 miles.

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 28, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate. Crash ratings are from NHTSA’s New Car Assessment Program. Fuel economy is from the EPA and DOE (fueleconomy.gov).

Complaint counts come from NHTSA’s public complaint database; we count each complaint once. The source records for this vehicle are on nhtsa.gov. Scores and trends are our own summaries of that data, described in the methodology. This page is not legal, safety or repair advice: for a specific vehicle, check its VIN at nhtsa.gov/recalls and ask a qualified mechanic. See an error? Tell us.