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2007 Ford F-150

Owner reports · Recalls · Investigations

Similar to other model years

Owner complaints for the 2007 Ford F-150 do not stand out strongly from the model-year median of 676.

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When problems were reported

Mileage at the reported incident

431 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.

  • Engine. Review the 105 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Power Train. Review the 57 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Vehicle Speed Control. Review the 54 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →

NHTSA owner reports · September 18, 2026 snapshot.

40 crash reports13 fire reports29 injury reports

Engine complaints

105 reports
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49,934 miles · May 19, 2014
Engine

I HAVE A 2007 FORD F-150 WITH A 5.4L V8 ENGINE. THERE WAS INTERMITTENT RATTLE NOISE (KNOCKING) AND ROUGH IDLE. AFTER THE VEHICLE WARMS UP AND I COME TO A STOP OR SLOW ROLL THE VEHICLE BEGINS TO SHAKE AND A LOUD KNOCKING NOISE IS HEARD IN THE ENGINE. THIS IS A KNOWN ISSUE WITH THIS ENGINE AND FORD DENIES IT IS. I HAD IT FIXED…

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I HAVE A 2007 FORD F-150 WITH A 5.4L V8 ENGINE. THERE WAS INTERMITTENT RATTLE NOISE (KNOCKING) AND ROUGH IDLE. AFTER THE VEHICLE WARMS UP AND I COME TO A STOP OR SLOW ROLL THE VEHICLE BEGINS TO SHAKE AND A LOUD KNOCKING NOISE IS HEARD IN THE ENGINE. THIS IS A KNOWN ISSUE WITH THIS ENGINE AND FORD DENIES IT IS. I HAD IT FIXED IN SEPTEMBER 2011, WHICH WAS COVERED UNDER WARRANTY WITH 49,934 MILES. THE VEHICLE HAS STARTED TO DO THE SAME THING AND CURRENTLY HAS 82,000 MILES ON IT. I WAS INFORMED BY BOTH THE DEALER AND FORD MOTOR COMPANY THEY WILL NOT REPAIR UNDER WARRANTY EVEN THOUGH THIS WAS PRIOR ISSUE DURING THE WARRANTLY TIME. DEALER WANTS APPROXIMATELY $300.00 TO INSPECT TO DETERMINE THE EXTENT OF DAMAGE TO THE ENGINE. THIS IS SAFETY ISSUE AS IT HAPPENS DURING SLOW SPEEDS OR IDLE AT STOP LIGHTS AND ONLY WAY TO MAKE IT STOP IS TO SHUT OFF THE VEHICLE OR REV UP THE RPMS. I BELIEVE THE TSB WAS AWARE OF THIS ISSUE IN 2010 BUT THE MANUFACTURE HAS NOT NOTIFIED CONSUMERS. THIS IS A MANUFACTURER DEFECT AND FORD MOTOR NEEDS TO REPAIR OR REPLACE THE ENGINE AT THEIR COST. *JS

NHTSA ODI #10592584

70,000 miles · May 12, 2014
EnginePower Train

I WAS DRIVING THREW TOWN LAST JUNE & ALL THE SUDDEN MY CHECK ENGINE LIGHT CAME ON & TRUCK STARTED RUNNING REALLY ROUGH & ACTED LIKE IT WAS STARVING FOR GAS OR FIRE SO I TOOK MY TRUCK TO A PARTS STORE & HAD CODE READ IT SHOWED A MISS FIRE @ #6 CYLINDER / SPARK PLUG IT COST ME ALMOST $1,200 TO GET IT FIXED . THAT WAS FOR ALL 8 PLU…

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I WAS DRIVING THREW TOWN LAST JUNE & ALL THE SUDDEN MY CHECK ENGINE LIGHT CAME ON & TRUCK STARTED RUNNING REALLY ROUGH & ACTED LIKE IT WAS STARVING FOR GAS OR FIRE SO I TOOK MY TRUCK TO A PARTS STORE & HAD CODE READ IT SHOWED A MISS FIRE @ #6 CYLINDER / SPARK PLUG IT COST ME ALMOST $1,200 TO GET IT FIXED . THAT WAS FOR ALL 8 PLUGS & COILS FOR REALLY NEEDS TO FIX THERE DESIGN FLAW ON THE 4.6L & 5.4L ENGINE THERE IS NO REASON A VEHICLE SHOULD COST THAT MUCH JUST TO CHANGE PLUGS JUST CAUSE THEY DON'T WANT TO FIX THERE MESS UP TO MAKE IT MORE AFFORDABLE TO THE PUBLIC.THEY SAY TILL THE NHTSA ISSUES A RECALL THEY WILL IGNORE THE PROBLEM WITH THE SPARK PLUGS & ALL THE ISSUES THAT COME WITH THEM SINCE THEY CHANGED THE MOTORS DESIGNS. THANK YOU CONSERNED CONSUMER/FIREFIGHTER [XXX] PLEASE TAKE SOME ACTION IN THIS MATTER. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6). *TR

NHTSA ODI #10587934

67,000 miles · Apr 16, 2014
Engine

TL* THE CONTACT OWNS A 2007 FORD F-150. THE CONTACT STATED THAT WHILE TRAVELING VARIOUS SPEEDS, THE CONTACT HEARD A LOUD BANG IN THE ENGINE COMPARTMENT. UPON INSPECTION, IT WAS FOUND THAT THE SPARK PLUG HAD ERRONEOUSLY EJECTED. THE VEHICLE WAS TAKEN TO THE DEALER WHERE IT WAS FOUND THAT THE SPARK PLUG COIL NEEDED TO BE REPLACED.…

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TL* THE CONTACT OWNS A 2007 FORD F-150. THE CONTACT STATED THAT WHILE TRAVELING VARIOUS SPEEDS, THE CONTACT HEARD A LOUD BANG IN THE ENGINE COMPARTMENT. UPON INSPECTION, IT WAS FOUND THAT THE SPARK PLUG HAD ERRONEOUSLY EJECTED. THE VEHICLE WAS TAKEN TO THE DEALER WHERE IT WAS FOUND THAT THE SPARK PLUG COIL NEEDED TO BE REPLACED. THE VEHICLE WAS BEING REPAIRED. THE MANUFACTURER WAS CONTACTED ABOUT THE FAILURE. THE FAILURE MILEAGE WAS 67,000. THE VIN WAS NOT AVAILABLE.

NHTSA ODI #10583145

180,000 miles · Apr 7, 2014
Engine

WHILE DRIVING THE TRUCK A NOTICEABLE NOISE WAS GENERATED FROM THE ENGINE AND THE TRUCK SHUT OFF. THE LOW OIL SENOR CAME ON DURING OPERATION. SHUT ENGINE OFF AND RESTARTED NOISE STOPPED. *TR

NHTSA ODI #10578134

45,871 miles · Apr 2, 2014
Engine

TL* THE CONTACT OWNS A 2007 FORD F-150. THE CONTACT STATED THAT WHILE DRIVING APPROXIMATELY 5 MPH, A LOUD KNOCKING NOISE WAS HEARD FROM THE ENGINE COMPARTMENT. THE VEHICLE WAS TAKEN TO AN AUTHORIZED DEALER, WHO STATED THAT BOTH THE VTC SENSOR AND THE CAM PHASER WOULD NEED TO BE REPLACED. THE VEHICLE WAS BEING REPAIRED. THE MANUF…

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TL* THE CONTACT OWNS A 2007 FORD F-150. THE CONTACT STATED THAT WHILE DRIVING APPROXIMATELY 5 MPH, A LOUD KNOCKING NOISE WAS HEARD FROM THE ENGINE COMPARTMENT. THE VEHICLE WAS TAKEN TO AN AUTHORIZED DEALER, WHO STATED THAT BOTH THE VTC SENSOR AND THE CAM PHASER WOULD NEED TO BE REPLACED. THE VEHICLE WAS BEING REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE PROBLEM. THE APPROXIMATE FAILURE MILEAGE WAS 45,871.

NHTSA ODI #10576763

55,000 miles · Mar 28, 2014
Engine

TL* THE CONTACT OWNS A 2007 FORD F-150. THE CONTACT STATED THAT WHILE DRIVING APPROXIMATELY 60 MPH, THE VEHICLE SUDDENLY STALLED. THE ENGINE WAS RESTARTED AND THE VEHICLE RESUMED NORMALLY. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS NOT NOTIFIED. THE FAILURE MILEAGE WAS 55,000.

NHTSA ODI #10575415

48,880 miles · Mar 25, 2014
EnginePower TrainSuspension

HAD A BAD MISS AT HIGHWAY SPEEDS AND LIMPED HOME 15 MILES. REPLACED SPARK PLUGS AND IN THE PROCESS BROKE TWO IN THE HEAD. ONE DID NOT BREAK COMPLETELY OFF (#4) AND I NEEDED TO BORROW A PROTOTYPE TOOL FROM LISLE TOOL CORP. REMOVED AND REPLACED PLUGS FOLLOWING FORD PROCEDURES. TRUCK STILL HAD A MISS. REPLACED ALL EIGHT COIL PACKS …

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HAD A BAD MISS AT HIGHWAY SPEEDS AND LIMPED HOME 15 MILES. REPLACED SPARK PLUGS AND IN THE PROCESS BROKE TWO IN THE HEAD. ONE DID NOT BREAK COMPLETELY OFF (#4) AND I NEEDED TO BORROW A PROTOTYPE TOOL FROM LISLE TOOL CORP. REMOVED AND REPLACED PLUGS FOLLOWING FORD PROCEDURES. TRUCK STILL HAD A MISS. REPLACED ALL EIGHT COIL PACKS WHICH FIXED THE PROBLEM. TOTAL COST$380.00. TRUCK DOWN FOR 6 DAYS AWAITING TOOLS AND PARTS. DEVELOPED A VIBRATION AT HIGHWAY SPEEDS. ORIGINAL TIRES(PIRELLI) WERE SEPARATING. REPLACED TIRES(976.00), MUCH BETTER. STILL HAVE SLIGHT VIBRATION AT HIGHWAY SPEEEDS. FOUND LEFT FRONT HUB BEARING SEEPING GREASE AND FEELS STIFF. AWAITING PARTS TO DO REPAIRS. (98.00) HAD A TRANSMISSION SHUDDER AT LIGHT LOAD IN OVERDRIVE. FLUSHED TRANSMISSION WITH BG PRODUCTS AND FLUSH MACHINE. ADDED NEW TRANS FLUID AND CONDITIONER. TRANSMISSION NOW SHUDDERS AT ALL SPEEDS WHEN HOT. WILL ORDER NEW FILTER AND REPLACE. WILL ADD FRICTION MODIFIER AND TRY AGAIN. HAVE TO TOW ANOTHER VEHICLE THIS WEEKEND AND AM AFRAID TO DO SO. I AM COMPLETELY BLOWN AWAY THAT THESE PROBLEMS COULD HAPPEN TO ANY VEHICLE STARTING AT 48,000 MILES. ALL MAINTENANCE HAS BEEN PERFORMED WITH TOP OF THE LINE PRODUCTS. HAVE BEEN A FORD OWNER ALL MY LIFE AND AM COMPLETELY DIS-SATISFIED WITH THE PERFORMANCE OF THIS SUPPOSED NUMBER ONE SELLING TRUCK. THE STICKER PRICES OF THESE TRUCKS SHOULD BE A BUNCH LESS SINCE CHEAPLY PRODUCED CHINESE PARTS ARE SO PREVALENTLY USED. NOT HAPPY. *TR

NHTSA ODI #10574640

85,000 miles · Mar 4, 2014
Electrical SystemEngineFuel/propulsion System

FIRST WHY WAS" THIS VEHICLE INCLUDED IN THE RECALL OF BAD THROTTLE BODY I HAD THE SAME PROBLEM AS PEOPLE ARE HAVING WITH THE FORD ESCAPE. I REPORTED THIS BACK IN 2012 WHEN IT WAS BROUGHT TO THE ATTENTION OF THE NHTSA I DID NOT RECEIVE A RESPONSE THEN BUT THERE ARE THE SAME PROBLEMS WITH THE F-150 I HAD TO REPLACE MINE @ A COS…

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FIRST WHY WAS" THIS VEHICLE INCLUDED IN THE RECALL OF BAD THROTTLE BODY I HAD THE SAME PROBLEM AS PEOPLE ARE HAVING WITH THE FORD ESCAPE. I REPORTED THIS BACK IN 2012 WHEN IT WAS BROUGHT TO THE ATTENTION OF THE NHTSA I DID NOT RECEIVE A RESPONSE THEN BUT THERE ARE THE SAME PROBLEMS WITH THE F-150 I HAD TO REPLACE MINE @ A COST OF OVER $600.00 AND ALSO DAMAGED MY ALTERNATOR I WAS DRIVING IN TRAFFIC WHEN IT WENT IN LIMP HOME MODE SHOWING A WRENCH SYMBOL WITH LOST OF POWER AND ACCELERATION, I ALMOST WAS HIT BY SEVERAL VEHICLES AS THERE WAS KNOW WHERE TO PULL OVER TIME. THIS IS THE SAME THROTTLE BODY THAT COMES ON THE FORD ESCAPE AND IT SHOULD BE INCLUDED WITH THAT GROUP OF RECALLS. *TR

NHTSA ODI #10566990

152,000 miles · Feb 27, 2014
Engine

TL* THE CONTACT OWNS A 2007 FORD-150. THE CONTACT STATED THAT WHEN HE CAME TO A COMPLETE STOP, HE HEARD A LOUD NOISE COMING FROM THE ENGINE. THE VEHICLE WAS TAKEN TO A DEALER, WHO DIAGNOSED THAT THE TIMING CHAIN NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED. THE FAILURE WAS RECURRING. THE MANUFACTURER WAS MADE AWARE OF THE PRO…

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TL* THE CONTACT OWNS A 2007 FORD-150. THE CONTACT STATED THAT WHEN HE CAME TO A COMPLETE STOP, HE HEARD A LOUD NOISE COMING FROM THE ENGINE. THE VEHICLE WAS TAKEN TO A DEALER, WHO DIAGNOSED THAT THE TIMING CHAIN NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED. THE FAILURE WAS RECURRING. THE MANUFACTURER WAS MADE AWARE OF THE PROBLEM. THE APPROXIMATE FAILURE MILEAGE WAS 152,000.

NHTSA ODI #10566275

129,000 miles · Feb 8, 2014
Engine

MY 2007 FORD F-150 XLT 5.4 TRITON WAS BROUGHT IN FOR A ROUTINE TUNE UP. WHEN REMOVAL OF THE SPARK PLUGS 6 OF 8 BROKE OFF. THE MECHANICS ATTEMPTED TO REMOVE THE BROKEN PARTS BUT COULD NOT. NOW I AM TOLD I NEED TO HAVE THE HEADS OF THE MOTOR TAKEN OFF AND OR HAVE THE ENGINE REPLACED. THIS MOTOR HAS RUN FINE EXCEPT FOR MIS FIREING…

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MY 2007 FORD F-150 XLT 5.4 TRITON WAS BROUGHT IN FOR A ROUTINE TUNE UP. WHEN REMOVAL OF THE SPARK PLUGS 6 OF 8 BROKE OFF. THE MECHANICS ATTEMPTED TO REMOVE THE BROKEN PARTS BUT COULD NOT. NOW I AM TOLD I NEED TO HAVE THE HEADS OF THE MOTOR TAKEN OFF AND OR HAVE THE ENGINE REPLACED. THIS MOTOR HAS RUN FINE EXCEPT FOR MIS FIREING SPARK PLUGS. I TALKED TO OTHER MECHANICS AND AUTO PART STORES, PRIOR TO HAVING THIS WORK DONE AND THEY ALL WARNED ME THAT THIS MAY HAPPEN, THE BREAKING OFF OF THE SPARK PLUGS. I CAN`T AFFORD TO HAVE THIS MAJOR WORK DONE AT THIS TIME, AND I FEEL THAT FORD HAS A BAD PRODUCT IN IT`S SPARK PLUG. HAS THERE BEEN ANY OTHER COMPLAINTS IN THIS MATTER [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6). *TR

NHTSA ODI #10563480

Official recalls

2

08V523000 · Engine And Engine Cooling

Oct 8, 2008

ROUSH IS RECALLING 213 MY 2007-2008 FORD F-150 TRUCKS ALTERED TO OPERATE USING LIQUID PROPANE INJECTION. THE HYDRO-CARBON PAPER AFFIXED TO THE INSIDE OF THE AIRBOX LID WITH ADHESIVE MAY BECOME DISLODGED DURING OPERATION.

Consequence & remedy

Consequence: THIS FAILURE MAY RESULT IN A LOSS OF PERFORMANCE, ILLUMINATION OF THE MALFUNCTION INDICATOR LAMP (MIL) AND, IN EXTREME CASES, A STALLING OF THE VEHICLE DURING OPERATION WITHOUT NOTICE, WHICH COULD RESULT IN A CRASH.

Remedy: DEALERS WILL REPLACE THE AIRBOX LID WITH A NEW ONE THAT INCLUDES THE HYDRO-CARBON PAPER WHICH HAS BEEN AFFIXED USING AN ADHESIVE PROMOTER AND GREATER PRESSURE AS RECOMMENDED BY THE MANUFACTURER FREE OF CHARGE. THE RECALL BEGAN ON OCTOBER 21, 2008. OWNERS MAY CONTACT ROUSH AT 1-866-307-6788.

07V278000 · Fuel System, Gasoline:storage:tank Assembly

Jun 28, 2007

ON CERTAIN TRUCKS BUILT WITH 26 GALLON FUEL TANKS, THE FUEL TANK MAY HAVE A DEPRESSION AT THE SEAM BETWEEN THE TOP AND BOTTOM HALVES OF THE TANK (NOT VISIBLE FROM OUTSIDE THE FUEL TANK). IF A DEPRESSION IS LARGE ENOUGH, FUEL MAY PERMEATE THE FUEL TANK WALL RESULTING IN A FUEL ODOR, OR A "SERVICE ENGINE SOON" INDICATOR LIGHT.

Consequence & remedy

Consequence: IF LEFT UNCORRECTED, A FUEL LEAK COULD EVENTUALLY DEVELOP. A FUEL LEAK IN THE PRESENCE OF AN IGNITION SOURCE COULD RESULT IN A FIRE.

Remedy: DEALERS WILL REPLACE THE FUEL TANK FREE OF CHARGE. THE RECALL BEGAN ON JUNE 25, 2007. OWNERS MAY CONTACT FORD AT 1-866-436-7332.

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

1

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