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2009 Mercury Mariner

Owner reports · Recalls · Investigations

More warning signs than most Mariner years

Owner complaints for the 2009 Mercury Mariner are substantially higher than the model-year median of 63.

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When problems were reported

Mileage at the reported incident

251 reports with mileage · 64 unknown

NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.

What to inspect

Issues worth paying extra attention to based on owner reports.

  • Steering. Review the 167 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Engine. Review the 53 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Power Train. Review the 44 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →

NHTSA owner reports · September 18, 2026 snapshot.

9 crash reports0 fire reports3 injury reports

What owners actually said

315 reports
99,800 miles · Jan 4, 2014
EnginePower Train

WHILE DRIVING, THE VEHICLE STARTED LOSING POWER AND THE WRENCH LIGHT CAME ON; STOPPED AND HAD A HARD TIME CRANKING BUT WAS ABLE TO GO ON. 2ND TIME PULLING ONTO A BUSY STREET, SAME INCIDENT, ABLE TO GET TO CENTER LAN AND RECRANK THIS TIME SURGING FORWARD BUT GAINED CONTROL AND WENT ON, VERY UNNERVING SITUATION, SCARED TO DRIVE …

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WHILE DRIVING, THE VEHICLE STARTED LOSING POWER AND THE WRENCH LIGHT CAME ON; STOPPED AND HAD A HARD TIME CRANKING BUT WAS ABLE TO GO ON. 2ND TIME PULLING ONTO A BUSY STREET, SAME INCIDENT, ABLE TO GET TO CENTER LAN AND RECRANK THIS TIME SURGING FORWARD BUT GAINED CONTROL AND WENT ON, VERY UNNERVING SITUATION, SCARED TO DRIVE LONG DISTANCES. *TR

NHTSA ODI #10558442

70,000 miles · Jan 2, 2014
Fuel System, GasolineVehicle Speed Control

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. *TR

NHTSA ODI #10558150

60,000 miles · Dec 28, 2013
EngineVehicle Speed Control

WHEN PULLING UP TO A STOP SIGN THE CAR JUST STOPPED NEXT TIME COMING OFF INTERSTATE TO STOP THE VEHICLE KINDA OF LUNGED THE NEXT TINE IT JUST TRIED TO STALL HAD TO PUT IN NEUTRAL AND KEEP FOOT ON GAS TO KEEP IT RUNNING. *TR

NHTSA ODI #10557514

94,000 miles · Dec 27, 2013
Fuel System, GasolineVehicle Speed Control

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 FO…

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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. *TR

NHTSA ODI #10557434

69,000 miles · Dec 11, 2013
Power Train

I WAS DRIVING MY 2009 MERCURY MARINER AND SUDDENLY LOST THE ABILITY TO ACCELERATE. A WRENCH LIGHT ILLUMINATED ON MY DASH AND THE ONLY THING I COULD DO WAS COAST TO A STOP. PUSHING THE GAS PEDAL DID NOTHING. I WAS ABLE TO VERY SLOWLY GET THE CAR TO A PARKING LOT (IT MOVED AT AN IDLE SPEED, BUT WOULD NOT ACCELERATE OTHERWISE). …

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I WAS DRIVING MY 2009 MERCURY MARINER AND SUDDENLY LOST THE ABILITY TO ACCELERATE. A WRENCH LIGHT ILLUMINATED ON MY DASH AND THE ONLY THING I COULD DO WAS COAST TO A STOP. PUSHING THE GAS PEDAL DID NOTHING. I WAS ABLE TO VERY SLOWLY GET THE CAR TO A PARKING LOT (IT MOVED AT AN IDLE SPEED, BUT WOULD NOT ACCELERATE OTHERWISE). WHEN I GOT TO THE PARKING LOT, I TURNED THE CAR OFF. AFTER WAITING A FEW MINUTES, I TURNED THE CAR BACK ON AND IT SEEMED FINE. I TOOK IT TO A FORD DEALERSHIP AND THEY DIAGNOSED IT AS BEING A PROBLEM WITH THE THROTTLE BODY, WHICH THEY ENDED UP REPLACING. THIS ISSUE OCCURRED ON 12/10/2013 ON A 2009 MERCURY MARINER THAT I PURCHASED NEW IN NOVEMBER OF 2008. IT HAD APPROXIMATELY 69,000 MILES ON IT WHEN THE INCIDENT OCCURRED. I WAS DRIVING AT A SPEED OF ABOUT 40 MPH WHEN IT HAPPENED. IN SEARCHING THE INTERNET, I FOUND THAT THIS IS A VERY COMMON PROBLEM. THERE ARE NUMEROUS NEWS REPORTS, FORUM AND BLOG POSTINGS, AND YOUTUBE VIDEOS OF PEOPLE EXPERIENCING THE SAME PROBLEM WITH THE THROTTLE BODY ON THEIR ESCAPES AND MARINERS. I ALSO FEEL THAT IT IS A SAFETY ISSUE. HAD I BEEN ON THE HIGHWAY WHEN THIS OCCURRED, I VERY LIKELY WOULD'VE CAUSED AN ACCIDENT. (I WAS ACTUALLY JUST ABOUT TO ENTER THE HIGHWAY WHEN THIS INCIDENT OCCURRED.) *TR

NHTSA ODI #10555548

95,000 miles · Nov 27, 2013
Power Train

CAR HAD PROBLEMS WITH LAGGING DURING ACCELERATION. I WAS DRIVING TO THE BANK AND THE CAR COMPLETELY STOPPED RESPONDING TO THE GAS PEDAL.A WRENCH LIGHT POPPED UP AS WELL AS CHECK ENGINE LIGHT. HAD TO PULL OVER BECAUSE MY CAR WOULD NO LONGER ACCELERATE AND QUICKLY STOPPED MOVING. I WAS TOLD BY MECHANIC IT WAS THE THROTTLE BODY. …

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CAR HAD PROBLEMS WITH LAGGING DURING ACCELERATION. I WAS DRIVING TO THE BANK AND THE CAR COMPLETELY STOPPED RESPONDING TO THE GAS PEDAL.A WRENCH LIGHT POPPED UP AS WELL AS CHECK ENGINE LIGHT. HAD TO PULL OVER BECAUSE MY CAR WOULD NO LONGER ACCELERATE AND QUICKLY STOPPED MOVING. I WAS TOLD BY MECHANIC IT WAS THE THROTTLE BODY. *TR

NHTSA ODI #10553990

109,500 miles · Nov 27, 2013
Vehicle Speed Control

TRAVELING ALONG WITH CRUISE CONTROL SET AT 65 WHEN ALL OF A SUDDEN MY VEHICLE DECELERATES. THE "THROTTLE BODY/THROTTLE POSITION SWITCH" INDICATOR LIGHT ILLUMINATED. VEHICLE HAS HAD INTERMITTENTLY GONE INTO "LIMP" SINCE THEN. LATELY IT HAS HAPPENED AT LEAST ONCE PER DAY, OFTEN WHEN TRYING TO ACCELERATE QUICKLY OR ABOVE 40MPH. CHE…

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TRAVELING ALONG WITH CRUISE CONTROL SET AT 65 WHEN ALL OF A SUDDEN MY VEHICLE DECELERATES. THE "THROTTLE BODY/THROTTLE POSITION SWITCH" INDICATOR LIGHT ILLUMINATED. VEHICLE HAS HAD INTERMITTENTLY GONE INTO "LIMP" SINCE THEN. LATELY IT HAS HAPPENED AT LEAST ONCE PER DAY, OFTEN WHEN TRYING TO ACCELERATE QUICKLY OR ABOVE 40MPH. CHECK ENGINE LIGHT ILLUMINATED YESTERDAY (11/26/2013) AND INDICATED A P2111 DIAGNOSTIC CODE (THROTTLE ACTUATOR STUCK OPEN). THIS IS APPARENTLY A FAIRLY COMMON ISSUE ALREADY UNDER INVESTIGATION. THE SOLUTION SEEMS TO BE HAVE A DEALER REPLACE THE THROTTLE BODY (ROUGHLY $400 PARTS AND LABOR). *TR

NHTSA ODI #10553974

94,000 miles · Nov 24, 2013
Steering

THE 2009 MERCURY MARINER IS EXPERIENCING INTERMITTENT FAILURE OF THE POWER STEERING SYSTEM. (AT LEAST 3 TIMES SO FAR) WHEN THE CAR IS STARTED, THE STEERING IS NEARLY IMPOSSIBLE TO MOVE. REPEATED RESTARTING OF THE CAR WILL SOMETIMES RESTART THE POWER STEERING AND THEN THE CAR IS DRIVABLE UNTIL IT IS SHUT OFF. THE DEALER TELLS …

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THE 2009 MERCURY MARINER IS EXPERIENCING INTERMITTENT FAILURE OF THE POWER STEERING SYSTEM. (AT LEAST 3 TIMES SO FAR) WHEN THE CAR IS STARTED, THE STEERING IS NEARLY IMPOSSIBLE TO MOVE. REPEATED RESTARTING OF THE CAR WILL SOMETIMES RESTART THE POWER STEERING AND THEN THE CAR IS DRIVABLE UNTIL IT IS SHUT OFF. THE DEALER TELLS US THAT THE ONLY REPAIR AUTHORIZED BY FORD IS THE COMPLETE REPLACEMENT OF THE STEERING COLUMN - AN APPROXIMATELY $1300.00 PART PLUS THE HOURLY RATE. THIS IS AN EXTREMELY DANGEROUS TYPE OF FAILURE. IF IT WOULD OCCUR WHILE MY 17 YEAR OLD DAUGHTER IS DRIVING THE CAR, SHE WOULD BE UNABLE TO CONTROL THE VEHICLE AND WOULD MOST LIKELY CAUSE AN ACCIDENT. *TR

NHTSA ODI #10553631

67,650 miles · Nov 9, 2013
Power Train

THE 2009 MERCURY MARINER HAS AN ISSUE THAT OCCURS WHILE OPERATING THE VEHICLE. THE PROBLEM OCCURRED WHEN POWER WAS CUT OFF FROM THE ACCELERATION, THE WRENCH SYMBOL ON THE DASHBOARD ILLUMINATED (WHICH INDICATES A POWERTRAIN/THROTTLE CONTROL PROBLEM), AND I WAS ONLY ABLE TO COAST THE VEHICLE TO PARK. THE VEHICLE NEVER GAVE ANY I…

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THE 2009 MERCURY MARINER HAS AN ISSUE THAT OCCURS WHILE OPERATING THE VEHICLE. THE PROBLEM OCCURRED WHEN POWER WAS CUT OFF FROM THE ACCELERATION, THE WRENCH SYMBOL ON THE DASHBOARD ILLUMINATED (WHICH INDICATES A POWERTRAIN/THROTTLE CONTROL PROBLEM), AND I WAS ONLY ABLE TO COAST THE VEHICLE TO PARK. THE VEHICLE NEVER GAVE ANY INDICATION THAT THERE WAS A PROBLEM UNTIL THE WRENCH LIT UP AND THE ACCELERATOR STOPPED WORKING. IT STARTED A WEEK AGO AND HAS HAPPENED A TOTAL OF 3 TIMES SINCE (WITH MINIMAL DRIVING). ONCE THE PROBLEM HAPPENS AND I STOP THE CAR, I AM ABLE TO PUT IT IN PARK, TURN THE CAR OFF, START IT BACK UP, AND DRIVE AGAIN LIKE NOTHING HAPPENED. THIS IS A VERY UNUSUAL PROBLEM AND LOOKING ONLINE, I SEE IT MAY BE A COMMON ONE. *TR

NHTSA ODI #10551600

68,000 miles · Nov 8, 2013
Vehicle Speed Control

I WAS DRIVING ON THE HIGHWAY AND SUDDENLY THE VEHICLE LOST ALL SPEED CONTROL. I COULD NOT ACCELERATE AND THE CAR BEGAN SLOWING DOWN. I HAD TO QUICKLY CHANGE LANES AND PULL OVER TO THE SHOULDER. I PUT THE CAR IN PARK AND TURNED OFF THE ENGINE, WAITED A FEW MINUTES, AND THEN WAS ABLE TO START THE CAR AGAIN. THIS SAME THING HAPPENE…

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I WAS DRIVING ON THE HIGHWAY AND SUDDENLY THE VEHICLE LOST ALL SPEED CONTROL. I COULD NOT ACCELERATE AND THE CAR BEGAN SLOWING DOWN. I HAD TO QUICKLY CHANGE LANES AND PULL OVER TO THE SHOULDER. I PUT THE CAR IN PARK AND TURNED OFF THE ENGINE, WAITED A FEW MINUTES, AND THEN WAS ABLE TO START THE CAR AGAIN. THIS SAME THING HAPPENED TWO DAYS LATER. I HAVE READ OTHER COMPLAINTS ABOUT THIS SAME ISSUE HAPPENING WITH MARINERS BETWEEN 2009-2011. THIS NEEDS TO BE RECALLED AND FIXED. IT IS INCREDIBLY DANGEROUS TO LOSE ALL ACCELERATION CONTROL GOING 65 MPH!! *TR

NHTSA ODI #10551473

Official recalls

1

14V284000 · Steering:electric Power Assist System

May 29, 2014

Ford Motor Company (Ford) is recalling certain model year 2008-2011 Ford Escape and Mercury Mariner vehicles manufactured August 18, 2006, through September 11, 2010. The affected vehicles have a steering torque sensor that may not be able to properly detect driver steering input. As a result, the system could remove the Electric Power Steering (EPS) assist.

Consequence & remedy

Consequence: If power steering assist is lost, greater driver effort would be required to steer the vehicle at low speeds, increasing the risk of a crash.

Remedy: Ford will notify owners, and dealers will update the software for the power steering control module (PSCM) and the instrument cluster module, free of charge. If a vehicle shows a history of a loss of the torque sensor signal or fault codes relating to the PSCM when the vehicle is brought in for the recall remedy, the affected components will be replaced, free of charge. The recall began on July 18, 2014. Owners may contact Ford customer service at 1-800-392-3673. Ford's number for this recall is 14S05.

Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗

NHTSA investigations

2

DP15001 · Loss Of Power Steering While Driving

Opened Apr 1, 2015 · Closed Jun 14, 2018

Status: closed (inferred from source dates) · Steering:electric Power Assist System

On May 27, 2014, amended June 2, 2014, Ford Motor Company (Ford) submitted a Defect Information Report (DIR) to NHTSA describing a safety defect that may result in a sudden loss of power steering assist while driving in approximately 746,067 model year (MY) 2008 through 2011 Ford Escape vehicles equipped with electric power assisted steering (NHTSA 14V-284, Ford 14S05). Ford's DIR described the defect condition as a poor signal to noise ratio [SNR] in the torque sensor within the Electric Power Assisted Steering (EPAS) system [which] does not allow the PSCM to determine the driver's steering input. When the system detects this fault condition, it transitions the EPAS system to the fail-safe/manual steering mode.Ford's DIR indicates that loss of power steering assist while driving would require higher steering effort at lower vehicle speeds, which may result in an increased risk of a crash.Ford's remedy instructs dealers to check the Power Steering Control Module (PSCM) for Diagnostic Trouble Codes (DTCs) to determine the proper repair procedure. If no DTCs are present, dealers are to update the PSCM and instrument cluster module software. The updated PSCM software changes the torque sensor fault strategy so that the SNR condition does not result in a loss of power steering assist while driving.In addition, audible and visual warnings are provided for torque sensor faults.If DTCs indicating faults in the torque sensor, PSCM or Power Steering Motor (motor) are present in the initial recall inspection, the dealer performs the following repairs: 1) replaces the torque sensor for torque sensor faults (DTC B2278); or 2) replaces the steering column for faults related to the PSCM (DTC B1342) or motor (DTC B2277).Continued in attachment pages

PE13003 · Electronic Throttle Body Malfunction

Opened Feb 21, 2013 · Closed Feb 28, 2014

Status: closed (inferred from source dates) · Engine

On February 21, 2013, the Office of Defects Investigations (ODI) opened Preliminary Evaluation PE13-003 to investigate allegations of electronic throttle body (ETB) failures resulting in sudden reduction of engine power in model year (MY) 2009-2013 Ford Escape, Fusion, Mariner and Milan vehicles. During this investigation, Ford identified a condition in subject vehicles equipped with 2.5L and 3.0L engines that may result in a sudden reduction of engine power.According to Ford, the ETB internal motor contacts may develop a high resistance material buildup condition on the commutator, resulting in intermittent electrical connectivity and reduced engine power. When this condition occurs, the Malfunction Indicator Lamp (MIL) or Wrench light will illuminate and the vehicle may enter a limited limp home mode.Ford?s trade name for the feature is Failure Mode Effects Management (FMEM) mode.In this mode, engine power and vehicle speed are reduced, while full function of the power steering, power braking, lighting, and climate control systems are maintained.ODI?s complaint analysis indicate that the predominant failure mode involved reduced motive power associated with the limited limp home mode with engine speeds limited to approximately 900 RPM. Analysis of warranty claims provided by Ford identified 59,807 claims related to ETB replacements and approximately 50 percent of claims are associated with diagnostic trouble codes (DTC) P2111, Throttle Body Stuck Open, and P2112, Throttle Body Stuck Closed.Ford described several factors where the ETB motor may fail resulting in DTCs P2111 or P2112 but the failure is not an existing stuck open or closed ETB valve position.According to Ford, the ETB control strategy provides the driver with three FMEM modes that allow varying degrees of vehicle mobility depending on the severity of the fault detected.DTCs associated with stuck open or closed throttle valves are designated the highest failure severity resulting in engine speeds limited to high idle corresponding to the limited limp home mode.Vehicles are not likely to unexpectedly stall as a result of this condition, but drivers may characterize the reduced functionality as a stall, even though their vehicle may still has motive capability.Other FMEM limp modes may result in reduced engine performance but will maintain vehicle speed above 20mph. During this investigation, Ford and its suppliers, Delphi and Igarashi, updated the powertrain control module (PCM) software to include a throttle body motor cleaning cycle during key-on and modified the ETB internal motor components design, surface finish and material composition to improve durability. Additionally, Ford developed a remedy procedure and issued a special Customer Satisfaction Program (CSP) 13N03 extending the ETB warranty coverage and instructing dealers to update the powertrain calibration to improve vehicle performance in the event that intermittent electrical connectivity of the throttle body motor contacts occurs. The program extends the coverage for up to 10 years of service or 150,000 miles from the warranty start date of the vehicle, all vehicles are eligible for the program through January 31, 2015 regardless of mileage.Owners of the affected vehicles will be contacted by mail to take their vehicle to a Ford dealer who will reprogram the PCM to the latest calibration. The bulletin was sent to dealers on January 17, 2014 and the owner letter mailing began on January 27, 2014. See the investigative file for copies of Ford's bulletin and owner letter. This preliminary evaluation is closed. The closing of this investigation does not constitute a finding that