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2008 Mercury Mariner

Owner reports · Recalls · Investigations

More warning signs than most Mariner years

Owner complaints for the 2008 Mercury Mariner are substantially higher than the model-year median of 63.

About this comparison →

When problems were reported

Mileage at the reported incident

404 reports with mileage · 57 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 297 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Power Train. Review the 66 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Vehicle Speed Control. Review the 31 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 reports5 injury reports

Service Brakes complaints

29 reports
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125,000 miles · May 17, 2020
Service Brakes

MY 17 YEAR OLD DAUGHTER CAME HOME SAYING A MESSAGE WAS ON HER DASH ABOUT HER BRAKES IN OUR 2008 MERCURY MARINER HYBRID. I WAS ABOUT TO LEAVE SO I DECIDED TO TAKE HER CAR, AS SOON AS I PULLED OUT OF THE DRIVEWAY AND STARTED DOWN THE HILL WE LIVE ON, I NOTICED THE BRAKES DIDN'T FEEL RIGHT, I PRESSED ALL THE WAY DOWN TO GET THE CA…

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MY 17 YEAR OLD DAUGHTER CAME HOME SAYING A MESSAGE WAS ON HER DASH ABOUT HER BRAKES IN OUR 2008 MERCURY MARINER HYBRID. I WAS ABOUT TO LEAVE SO I DECIDED TO TAKE HER CAR, AS SOON AS I PULLED OUT OF THE DRIVEWAY AND STARTED DOWN THE HILL WE LIVE ON, I NOTICED THE BRAKES DIDN'T FEEL RIGHT, I PRESSED ALL THE WAY DOWN TO GET THE CAR TO SLOWLY COME TO A STOP, AS I DID THIS, I NOTICED A WARNING SOUND AND THE MESSAGE ON THE SCREEN SAID CHECK BRAKE SYSTEM, REGEN BRAKES DISABLED. I IMMEDIATELY TURNED THE CAR AROUND AND WENT HOME, WHEN TRYING TO STOP IN OUR DRIVEWAY, AGAIN THE BRAKES WERE NOT WORKING PROPERLY CAUSING US TO ALMOST HIT THE OTHER CAR IN THE DRIVEWAY. THIS IS EXTREMELY CONCERNING AS THIS CAR IS OUR 17 YEAR OLD DAUGHTERS CAR. ONCE YOU GET THE CAR TO STOP, IF THE CAR IS POWERED OFF FOR A FEW MINUTES AND BACK ON THE BRAKES WORK AGAIN. THIS IS A SAFETY ISSUE AND SEEMS TO BE A COMMON PROBLEM. THIS HAPPENED YESTERDAY 5/16/2020, THE CAR HAS 120K MILES.

NHTSA ODI #11324855

132,000 miles · May 5, 2020
Service Brakes

HCU (HYDRAULIC CONTROL UNIT) FAILURE MEANING MY HYBRID VEHICLE CAN'T BRAKE WHETHER IN HYBRID MODE OR NORMAL MODE AND IT'S OVER A $5000 REPAIR. MY MARINER HAS BEEN SITTING IN MY DRIVEWAY FOR CLOSE TO 2 YEARS NOW, UNUSED, BECAUSE OF THIS KNOWN ISSUE. *TR

NHTSA ODI #11323317

150,000 miles · Apr 17, 2020
Service Brakes

BRAKES ARE INTERMITTENT, ABS LIGHT WILL COME ON ALONG WITH RED BRAKE LIGHT AND HYBRID REGEN BRAKES DISABLED. SOMETIMES CAR STOPS SOMETIMES CAR DOES NOT STOP. I HAVE LOOKED INTO IT AND SEVERAL PEOPLE HAVE REPORTED FAILURE. I DO NOT UNDERSTAND HOW SUCH A WELL DOCUMENTED OE FAILURE CAN GO FOR SO LONG WITHOUT RECTIFICATION.

NHTSA ODI #11321458

103,184 miles · Jan 27, 2020
Service BrakesSteeringSuspension

TL* THE CONTACT OWNS A 2008 MERCURY MARINER. THE CONTACT STATED ON SEVERAL OCCASIONS WHILE THE VEHICLE WAS IDLE OR BEING DRIVEN, THE STEERING WHEEL VIBRATED ABNORMALLY. THE CONTACT ALSO STATED THAT WHEN THE STEERING WHEEL WAS TURNED THERE WAS THERE WAS A HESITATION IN RESPONSE TO THE WHEELS RESPONDING. ADDITIONALLY, THE CONTACT …

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TL* THE CONTACT OWNS A 2008 MERCURY MARINER. THE CONTACT STATED ON SEVERAL OCCASIONS WHILE THE VEHICLE WAS IDLE OR BEING DRIVEN, THE STEERING WHEEL VIBRATED ABNORMALLY. THE CONTACT ALSO STATED THAT WHEN THE STEERING WHEEL WAS TURNED THERE WAS THERE WAS A HESITATION IN RESPONSE TO THE WHEELS RESPONDING. ADDITIONALLY, THE CONTACT STATED THAT THERE WAS A CLICKING SOUND IN THE STEERING. THE CONTACT STATED THAT THE CLICKING SOUND EMITTED FROM THE INTERMITTENT SHAFT. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC WHO REPLACED THE BRAKE PADS, BRAKE ROTORS, AND PROVIDED AN ALIGNMENT. NEITHER THE DEALER NOR THE MANUFACTURER WAS CONTACTED OR INFORMED OF THE FAILURE. THE FAILURE MILEAGE WAS 103,184.

NHTSA ODI #11302185

115,000 miles · Nov 25, 2019
Service Brakes

ABS AND REGEN BRAKES DISABLED WARNING LIGHTS WENT ON WHEN STARTING CAR FROM PARKED POSITION; HAVE BEEN ADVISED BY FORD DEALER AND ON LINE REPORTS BY CAR OWNERS THAT BRAKES CAN FAIL AND WE SHOULD NOT DRIVE THE CAR. REPLACING REGEN BRAKE SYSTEM MORE THAN 6K ; THIS IS A SAFETY PROBLEM REQUIRING MANUFACTURER RECALL;

NHTSA ODI #11282223

53,000 miles · Nov 13, 2019
Service Brakes

THE BRAKE LIGHT CAME ON AND INDICATED "REGEN BRAKES DISABLED". I BRAKED WHEN I CAME TO A TRAFFIC LIGHT AND ENDED UP SKIDDING INTO THE MIDDLE OF AN INTERSECTION. THE LOCAL FORD DEALER ADVISED TO REPLACE THE HCU FOR $5000. THE UNIT HAS 55K MILES ON IT. THIS HAS CONTINUED TO HAPPEN FOR THE LAST 2 YEARS, MOSTLY IN THE SUMMER WHE…

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THE BRAKE LIGHT CAME ON AND INDICATED "REGEN BRAKES DISABLED". I BRAKED WHEN I CAME TO A TRAFFIC LIGHT AND ENDED UP SKIDDING INTO THE MIDDLE OF AN INTERSECTION. THE LOCAL FORD DEALER ADVISED TO REPLACE THE HCU FOR $5000. THE UNIT HAS 55K MILES ON IT. THIS HAS CONTINUED TO HAPPEN FOR THE LAST 2 YEARS, MOSTLY IN THE SUMMER WHEN IT IS HOT AND HUMID, ALTHOUGH JUST TODAY IT HAPPENED AGAIN (IT WAS 35 DEGREES ALL DAY). I COULDN'T STOP IN TIME AND RAN OFF THE ROAD ONTO THE MEDIAN. SOME ONLINE RESEARCH HAS INDICATED THE PROBLEM IS NOT WITH THE HCU, BUT THE SENSORS (REPLACING THE HCU REESTABLISHES A GOOD CONNECTION WITH THE SENSORS)., BUT THE FORD DEALER KNOWS NOTHING ABOUT THIS FIX BECAUSE IT'S MUCH CHEAPER. SO, I HAVE NO CHOICE BUT TO CONTINUE TO DRIVE THIS TRAIN WRECK AND HOPE I'M NOT IN A SERIOUS ACCIDENT.

NHTSA ODI #11279927

240,000 miles · Jul 29, 2019
Service Brakes

BRAKE SYSTEM FAILURE, ABS FAILURE. HALF OR MORE OF BRAKING POWER DIMINISHES. WHILE GOING DOWN THE ROAD, VEHICLES TRIES STOPPING ITSELF, CREATING A FRONT END WOBBLE. WHEN HAVING TO USE THE BRAKES, TIRES SKID. CANNOT STOP VEHICLE QUICKLY, VERY DANGEROUS. CONSTANT BRAKE SMELL. BRAKE PADS WEAR OR DISINTEGRATE WITHIN 3 MONTHS. PROBLE…

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BRAKE SYSTEM FAILURE, ABS FAILURE. HALF OR MORE OF BRAKING POWER DIMINISHES. WHILE GOING DOWN THE ROAD, VEHICLES TRIES STOPPING ITSELF, CREATING A FRONT END WOBBLE. WHEN HAVING TO USE THE BRAKES, TIRES SKID. CANNOT STOP VEHICLE QUICKLY, VERY DANGEROUS. CONSTANT BRAKE SMELL. BRAKE PADS WEAR OR DISINTEGRATE WITHIN 3 MONTHS. PROBLEM WILL NOT GO AWAY WAS INTERMITTENT AT FIRST, BUT NOW CONSTANT. FORD DEALERSHIP REPORTS PART IS $6200 DOLLARS. THE VEHICLE IS NOT WORTH THAT.

NHTSA ODI #11240297

97,000 miles · Jun 17, 2019
Service Brakes

THE ANTI-LOCK BRICK MODULE HAS STOPPED WORKING. THE PART ALONE IS CLOSE TO $1,200 TO PURCHASE. UPON INVESTIGATING THIS PROBLEM WE FIND THAT IT IS VERY COMMON AND TENS OF THOUSANDS OF FORD BUILT CARS OF THIS VINTAGE HAVE THE SAME ISSUE. WHY HASN'T THERE BEEN A RECALL FOR SUCH A COMMON AND CRITICAL ISSUE?

NHTSA ODI #11220638

Mileage unknown · Jun 29, 2018
Service Brakes

TOOK TO DEALER FOR BRAKE PROBLEMS. POOR AND UNPREDICTABLE STOPPING, AFTER OVER $ 500 REPAIRS TO BRAKES. WORKED OK FOR A WEEK NOW WORST THAN THEY WERE BEFORE REPAIRS.BRAKES CANNOT BE TRUSTED.

NHTSA ODI #11104714

135,000 miles · Feb 16, 2018
Service Brakes

TAKATA RECALL MY ABS LIGHT AND BRAKE LIGHT COMES ON AND IF I DRIVE IT WITH THESE LIGHTS ON I SMELL MY BREAK PADS BURNING. I TOOK IT TO FORD AND THEY SAID IT WAS THE INTERNAL FAILURE OF THE HYDRAULIC CONTROL UNIT AND IT WOULD COST ME UPWARDS OF $5,885.00 TO REPLACE AND REPAIR THE PROBLEM. I HAVE SEARCHING THE INTERNET AND THERE A…

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TAKATA RECALL MY ABS LIGHT AND BRAKE LIGHT COMES ON AND IF I DRIVE IT WITH THESE LIGHTS ON I SMELL MY BREAK PADS BURNING. I TOOK IT TO FORD AND THEY SAID IT WAS THE INTERNAL FAILURE OF THE HYDRAULIC CONTROL UNIT AND IT WOULD COST ME UPWARDS OF $5,885.00 TO REPLACE AND REPAIR THE PROBLEM. I HAVE SEARCHING THE INTERNET AND THERE ARE SEVERAL OTHER PEOPLE WITH THE SAME PROBLEM WITH THIS VEHICLE AND FORD ESCAPES. (WHICH IS BASICALLY THE SAME VEHICLE. IF THERE ARE THIS MANY COMPLAINTS MAYBE ITS WORTH LOOKING INTO ON DOTS PART. IT IS A SAFETY ISSUE FOR SURE CONSIDERING MY BRAKES GO TO THE FLOOR WHEN THE ABS AND BRAKE LIGHTS ARE ON. I CAN TURN MY SUV OFF AND REMOVE THE KEY AND THEN PUT THE KEY BACK IN AND START IT AGAIN UNTIL THE LIGHTS GO OFF AND I DON'T HAVE AN ISSUE. BUT WHEN I FIRST GET IN THE VEHICLE AND START IT THE LIGHTS DO IN FACT COME ON. PLEASE HELP ALL CONSUMERS WITH THIS DANGEROUS SITUATION THAT SHOULD HAVE BEEN RECALLED ALREADY ON FORD/MERCURY'S HYDRAULIC CONTROL UNIT.

NHTSA ODI #11073243

Official recalls

3

15V606000 · Power Train:automatic Transmission:gear Position Indication (prndl); Power Train:automatic Transmission:lever And Linkage:floor Shift

Sep 29, 2015

Ford Motor Company (Ford) is recalling certain model year 2001-2008 Ford Escape and Mercury Mariner vehicles manufactured March 31, 2001, to September 1, 2009. The affected vehicles are equipped with either a 2.3L or 3.0L engine and have had their CD4E transmission replaced with remanufactured one that was rebuilt between June 11, 2015 through July 15, 2015. These service repair part transmissions have a shift lever bolt that may not be properly tightened. As a result, the shift control lever could disengage from the transmission without warning.

Consequence & remedy

Consequence: If the shift lever disengages from the transmission, a driver may be unable to shift gear positions and the indicated shift position may not represent the gear position the vehicle is in. Should a disengagement occur while the vehicle is being driven, when the driver goes to stop and park the vehicle, the gear selection indicator may show that the transmission is in the "PARK" position, but the vehicle transmission may not actually be in the "PARK" gear position. If the vehicle is not in the "PARK" position there is a risk the vehicle will roll away as the driver and other occupants exit the vehicle or anytime thereafter. A vehicle rollaway increases the risk of injury to exiting occupants and bystanders.

Remedy: Ford will notify owners, and dealers will inspect the transmissions and either tighten the manual shift lever bolt or replace the manual shift lever assembly. These repairs will be performed free of charge. The recall began on October 23, 2015. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 15S28.

Additional source detail variants (2)

Power Train:automatic Transmission:lever And Linkage:floor Shift

Ford Motor Company (Ford) is recalling certain model year 2001-2008 Ford Escape and Mercury Mariner vehicles manufactured March 31, 2001, to September 1, 2009. The affected vehicles are equipped with either a 2.3L or 3.0L engine and have had their CD4E transmission replaced with remanufactured one that was rebuilt between June 11, 2015 through July 15, 2015. These service repair part transmissions have a shift lever bolt that may not be properly tightened. As a result, the shift control lever could disengage from the transmission without warning.

Consequence: If the shift lever disengages from the transmission, a driver may be unable to shift gear positions and the indicated shift position may not represent the gear position the vehicle is in. Should a disengagement occur while the vehicle is being driven, when the driver goes to stop and park the vehicle, the gear selection indicator may show that the transmission is in the "PARK" position, but the vehicle transmission may not actually be in the "PARK" gear position. If the vehicle is not in the "PARK" position there is a risk the vehicle will roll away as the driver and other occupants exit the vehicle or anytime thereafter. A vehicle rollaway increases the risk of injury to exiting occupants and bystanders.

Remedy: Ford will notify owners, and dealers will inspect the transmissions and either tighten the manual shift lever bolt or replace the manual shift lever assembly. These repairs will be performed free of charge. The recall began on October 23, 2015. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 15S28.

Power Train:automatic Transmission:gear Position Indication (prndl)

Ford Motor Company (Ford) is recalling certain model year 2001-2008 Ford Escape and Mercury Mariner vehicles manufactured March 31, 2001, to September 1, 2009. The affected vehicles are equipped with either a 2.3L or 3.0L engine and have had their CD4E transmission replaced with remanufactured one that was rebuilt between June 11, 2015 through July 15, 2015. These service repair part transmissions have a shift lever bolt that may not be properly tightened. As a result, the shift control lever could disengage from the transmission without warning.

Consequence: If the shift lever disengages from the transmission, a driver may be unable to shift gear positions and the indicated shift position may not represent the gear position the vehicle is in. Should a disengagement occur while the vehicle is being driven, when the driver goes to stop and park the vehicle, the gear selection indicator may show that the transmission is in the "PARK" position, but the vehicle transmission may not actually be in the "PARK" gear position. If the vehicle is not in the "PARK" position there is a risk the vehicle will roll away as the driver and other occupants exit the vehicle or anytime thereafter. A vehicle rollaway increases the risk of injury to exiting occupants and bystanders.

Remedy: Ford will notify owners, and dealers will inspect the transmissions and either tighten the manual shift lever bolt or replace the manual shift lever assembly. These repairs will be performed free of charge. The recall began on October 23, 2015. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 15S28.

14V526000 · Hybrid Propulsion System

Sep 3, 2014

Ford Motor Company (Ford) is recalling certain model year 2005-2008 Ford Escape hybrid electric vehicles manufactured October 13, 2003, to June 20, 2008, and 2006-2008 Mercury Mariner hybrid electric vehicles manufactured June 10, 2005, to June 20, 2008. The coolant pump for the hybrid system may fail resulting in the hybrid electronics overheating.

Consequence & remedy

Consequence: If the hybrid electronics system overheats, it may shut down the powertrain, resulting in a stall-like condition, increasing the risk of a crash.

Remedy: Ford will notify owners, and dealers will inspect and replace the original Motor Electronics Coolant (MEC) Pump with an improved brushless pump, free of charge. The recall is expected to begin on October 27, 2014. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 14S19.

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

PE08060 · Tire Valve Cracking

Opened Oct 14, 2008 · Closed Apr 9, 2009

Status: closed (inferred from source dates) · Tires:valve

ON OCTOBER 14, 2008, ODI OPENED PE08-060 TO INVESTIGATE ALLEGATIONS OF CRACKED AND LEAKING SNAP-IN TIRE VALVES IN MODEL YEAR (MY) 2007 VEHICLES MANUFACTURED BY FORD MOTOR COMPANY.THE VALVES WERE SUPPLIED TO FORD BY TOPSEAL AUTO-PARTS, A SUBSIDIARY OF THE SHANGHAI BAOLONG AUTOMOTIVE CORPORATION IN CHINA.VALVES MADE BY TOPSEAL FOR AFTERMARKET SALE WERE THE SUBJECT OF TWO RECENT SAFETY RECALLS BY TECH INTERNATIONAL (08T-018) AND DILL AIR CONTROLS (08T-028), THE LATTER OF WHICH WAS INVESTIGATED BY ODI IN PE08-036 AND EA08-022.THE DEFECT CONDITIONS ADDRESSED BY THE AFTERMARKET TIRE VALVE RECALLS BOTH INVOLVED INADEQUATE RESISTANCE TO OZONE CRACKING DUE TO ISSUES WITH THE SUPPLY OF ANTI-OZONANT CHEMICALS TO TOPSEAL FOR A PERIOD FROM JULY TO MID-NOVEMBER 2006.THE AFTERMARKET VALVES WERE COMPOUNDED WITH A BLEND OF EPDM AND NATURAL RUBBER, USING A RELATIVELY LOW PERCENTAGE OF EPDM (EPDM PROVIDES INHERENT RESISTANCE TO OZONE CRACKING).HENCE, THE NEED FOR ANTI-OZONANT CHEMICALS AND THE PROBLEMS WITH CRACKING WHEN THOSE CHEMICALS WERE MISSING OR OUT OF SPECIFICATION IN SOME LOTS OF VALVES.BOTH RECALL CAMPAIGNS INVOLVED INSPECTION PROGRAMS TO IDENTIFY AND REPLACE VALVES WITH VISIBLE SURFACE CRACKING.ALTHOUGH THE TOPSEAL VALVES SUPPLIED TO FORD ALSO APPEAR TO HAVE BEEN AFFECTED BY THE ANTI-OZONANT SUPPLY ISSUES IN MID TO LATE-2006, FORD INDICATED THAT ITS VALVES WERE MADE AT A DIFFERENT TOPSEAL PRODUCTION LINE AND WERE COMPOUNDED WITH A HIGHER PERCENTAGE OF EPDM RUBBER TO MEET MORE STRINGENT SPECIFICATIONS FROM FORD.ODI'S ANALYSIS OF COMPLAINT AND WARRANTY DATA PROVIDED BY FORD SHOWED THAT PROBLEMS WITH CRACKED TIRE VALVES WERE SIGNIFICANTLY HIGHER FOR MY 2007 VEHICLES PRODUCED FROM DECEMBER 2006 THROUGH MARCH 2007.FORD RESPONDED BY IMPLEMENTING CHANGES IN ITS MATERIAL SPECIFICATIONS FOR SNAP-IN RUBBER TIRE VALVES AND ALSO INCREASING THE QUALITY AND ACCEPTANCE STANDARDS FOR VALVES IMPORTED FOR USE IN ITS VEHICLES.WHILE THE COMPLAINT AND WARRANTY CLAIM RATES ARE ELEVATED FOR SUBJECT VEHICLES PRODUCED FROM DECEMBER 2006 THROUGH MARCH 2007, THE RATES OF LEAKING VALVES ARE WELL BELOW ONE PERCENT OF PRODUCTION FOR EACH OF THE PEAK MONTHS FOR ALL OF THE AFFECTED MODELS.A SUBSTANTIAL MAJORITY OF THE SUBJECT VEHICLES ARE EQUIPPED WITH TIRE PRESSURE MONITORING SYSTEMS (TPMS) WHICH WARN THE DRIVER WHEN ANY TIRE PRESSURES DROPS BELOW 25 PERCENT OF RECOMMENDED INFLATION PRESSURE. AS OUTLINED IN A LETTER TO ODI DATED APRIL 6, 2009, FORD HAS AGREED TO SEND LETTERS TO OWNERS OF CERTAIN MY 2007 AND 2008 FORD, LINCOLN AND MERCURY VEHICLES TO PROVIDE INFORMATION ABOUT THE CRACKING CONCERN. LETTERS WILL BE SENT TO OWNERS OF VEHICLES BUILT FROM NOVEMBER 2006 THROUGH MAY 2007.OWNERS CAN OPT FOR A FREE DEALER INSPECTION.VALVES EXHIBITING SURFACE CRACKS OR AIR LEAKAGE RELATED TO OZONE ATTACK WILL BE REPLACED BY FORD UNDER ITS NORMAL WARRANTY TERMS.FORD EXPECTS TO SEND THE LETTER BY APPROXIMATELY MID-MAY 2009. BASED ON THE USE OF TPMS IN THE MAJORITY OF SUBJECT VEHICLES AND THE RELATIVELY LOW RATES OF REPAIRS ASSOCIATED WITH LEAKING VALVES AND RESULTANT TIRE DAMAGE, ODI BELIEVES THAT THE ACTIONS FORD HAS AGREED TO TAKE WILL PROVIDE EFFECTIVE AND EXPEDITIOUS RESOLUTION FOR VEHICLES THAT WERE BUILT DURING THE PERIOD WHEN VALVES WITH INADEQUATE RESISTANCE TO OZONE CRACKING WERE MOST LIKELY TO HAVE BEEN USED IN VEHICLE PRODUCTION.FURTHER INVESTIGATION OF THIS MATTER WOULD NOT BE AN EFFICIENT ALLOCATION OF AGENCY RESOURCES.ACCORDINGLY, THIS INVESTIGATION IS CLOSED.THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY NHTSA THAT A SAFETY-RELATED DEFECT DOES NOT EXIST.THE AGENCY WILL CONTINUE TO