Check engine light or misfire

On July 22, 2022, the Office of Defects Investigation (ODI) granted a Defect Petition (DP22001) and opened a Preliminary Evaluation (PE22007) to investigate allegations of loss of motive power in model year (MY) 2021 Ford Bronco vehicles equipped with 2.7L EcoBoost engines. Complainants were reporting sudden engine failure while driving resulting in a loss of motive power, often without the ability to restart. During PE22007, the cause of engine failure and loss of motive power in the subject vehicles was determined to be intake valve fracture, and the full scope of vehicles affected by the subject defect was identified as all MY 2021-2022 Ford and Lincoln models equipped with either the 2.7L or 3.0L EcoBoost engines, referred to as the “Nano” engine family. If an intake valve fractures in the subject engines, it may drop into the cylinder and contact the piston, often resulting in catastrophic engine damage. On September 29, 2023, PE22007 was upgraded to an Engineering Analysis (EA23002) to further investigate the subject defect across the full scope of affected vehicles. During EA23002, ODI visited Ford facilities to review technical information related to intake valve fracture in “Nano” engines, coordinated with NHTSA’s Vehicle Research and Testing Center (VRTC), and analyzed updated field data relating the subject defect. Forensic analysis of fractured intake valves demonstrated that the defective components exhibited “grinding burn” or out of specificatio

During the EA17-002 investigation, the agency reviewed and analyzed reports of exhaust odors in the passenger cabins of Model Year 2011 to 2017 Ford Explorers. This investigation required an approach that incorporated knowledge and expertise from the automotive, medical, environmental health, and occupational safety fields. The agency conducted an in-depth investigation that encompassed the review of over 6,500 consumer complaints, conducting field inspections, and testing the relevant vehicles, both independently and in coordination with Ford and other entities. During the investigation, the evolution of Ford service bulletins intended to reduce the level of exhaust odors and carbon monoxide (CO) entering the occupant compartment was examined and independent tests to evaluate the effectiveness of the final Field Service Actions (FSA) for both consumer and police vehicles were conducted. As part of the investigation, the agency also examined the effects of cracked exhaust mani-cats on the measured CO levels in the vehicles and tested the FSA repairs to ensure they did not adversely impact occupant compartment CO levels due to cracked mani-cats.The investigation identified upfitting issues for Police Interceptor vehicles. Upfitting (sirens, lights, cages, auxiliary power, etc.) is typically performed by governmental fleet operations, independent repair facilities, or local Ford dealers after the sale of the new vehicle. Sealing issues caused by upfitting were responsible for t

During the National Highway Traffic Safety Administration?s (NHTSA?s) investigation into the Ford carbon monoxide allegations, the Office of Defects Investigation (ODI) identified additional Vehicle Owner Questionnaire (VOQ) reports with similar exhaust odor claims.Presently, ODI has identified 791 VOQs for Model Year 2011-2017 Ford Explorers pertaining to exhaust odor claims.ODI has identified three crashes and 41 injuries potentially linked this issue.The reported injuries range from unspecified to loss of consciousness, with the majority being nausea, headaches, or dizziness ? all of which can be symptomatic of carbon monoxide exposure.Additionally, Ford provided 2,400 reports including owner complaints, warranty claims, dealer field reports, and legal claims, that involve 2,051 vehicles that may be connected to the exhaust odor issue.NHTSA's Vehicle Test and Research Center tested multiple vehicles, including complaint vehicles, during the investigation.ODI also conducted field inspections of complaint vehicles and crashes involving police units that occurred while the officers were on duty.When possible, data was collected to quantify carbon monoxide levels in the examined vehicles.Based on the information gathered to date, NHTSA upgraded this investigation to an Engineering Analysis (EA17-002).

ON SEPTEMBER 6, 2005, ODI RECEIVED A PETITION REQUESTING THAT THE AGENCY INVESTIGATE ALLEGATIONS OF ENGINE SPARK PLUG EJECTION IN CERTAIN MODEL YEAR 1997 THROUGH 2004 FORD VEHICLES WITH TRITON V-8 AND V-10 ENGINES.ODI RECEIVED A TOTAL OF 474 NON-DUPLICATIVE COMPLAINTS ON THE SUBJECT VEHICLES WHERE THE COMPLAINANT, OR THE DEALER REPAIRING THE VEHICLE, REPORTED THAT A SPARK PLUG DETACHED FROM THE CYLINDER AND/OR EJECTED FROM THE ENGINE.AS OF DECEMBER 8, 2005, ODI IS NOT AWARE OF ANY ALLEGATIONS WHERE THE ALLEGED DEFECT RESULTED IN A LOSS OF VEHICLE CONTROL, A CRASH, AN INJURY, OR A FATALITY IN ANY OF THE 10,319,810 SUBJECT VEHICLES.IN ADDITION, ODI IS AWARE OF ONLY TWO INCIDENTS WHERE THE VEHICLE STALLED WITHOUT RESTART.INFORMATION CONTAINED IN THE ODI CONSUMER COMPLAINTS AND OBTAINED FROM 72 TELEPHONE INTERVIEWS WITH COMPLAINANTS SHOWED THE FOLLOWING:(1) 99% OF THE COMPLAINTS WERE ON MY 1997 TO 2002 SUBJECT VEHICLES.(2) MOST THE COMPLAINANTS REPORTED HEARING A LOUD POP WHILE DRIVING OR UPON STARTING UP THE VEHICLE FOLLOWED BY A LOUD, REPETITIVE CLICKING OR POPPING SOUND.(3) MANY OF THE COMPLAINANTS REPORTED THAT THE POPPING SOUND WAS ACCOMPANIED BY SOME LOSS OF VEHICLE POWER; HOWEVER, IN 99% OF THE INCIDENTS REPORTED, THE VEHICLE DID NOT STALL.IN THE VERY FEW INCIDENTS WHERE THE VEHICLE DID STALL, MOST VEHICLES COULD BE RESTARTED.(4) ONLY A SMALL PERCENTAGE OF THE COMPLAINANTS CITED THAT THEY SMELLED GAS OR A SLIGHT BURNING SMELL WHEN THE INCIDENT OCCURRED.(5) IN ALL BUT A VER

EA05-005 IS CLOSED WITH FORD?S ACTIONS IN RECALLS 05V-017, 05V-388, AND 06V-286, RECALLING APPROXIMATELY 6.7 MILLION VEHICLES EQUIPPED WITH TEXAS INSTRUMENTS SPEED CONTROL DEACTIVATION SWITCHES (SCDS).THE BRAKE SYSTEMS IN THESE RECALLED VEHICLES GENERATE A VACUUM THAT CAN POTENTIALLY CAUSE THE SCDS TO FAIL AND, IN CERTAIN SWITCH INSTALLATION ORIENTATIONS, CATCH FIRE.FORD IS ALSO INCLUDING THE ENTIRE POPULATION OF 1998 EXPLORERS.FORD HAS INFORMED ODI THAT TESTING TO DETERMINE THE CAUSE OF FAILURES IN THE 1998 EXPLORERS WILL CONTINUE AFTER THIS INVESTIGATION IS CLOSED.ODI BELIEVES THAT THE VEHICLES EXHIBITING THE FACTORS CAUSING SCDS FAILURE DESCRIBED IN THIS REPORT CORRELATE WELL WITH THE OBSERVED FAILURE RATES ON THESE VEHICLES BY MODEL AND MODEL YEAR.THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY NHTSA THAT A SAFETY-RELATED DEFECT DOES NOT EXIST IN THE NON-RECALLED VEHICLES MANUFACTURED WITH SCDS THAT ARE NOT INCLUDED IN FORD?S RECALLS.ODI WILL CONTINUE TO MONITOR THE NON-RECALLED POPULATION FOR INCIDENCE OF ENGINE COMPARTMENT FIRES.THE AGENCY RESERVES THE RIGHT TO TAKE FURTHER ACTION IF WARRANTED BY THE CIRCUMSTANCES.SEE ATTACHED CLOSING REPORT FOR DETAILS.

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THIS INVESTIGATION REVEALED THAT CONSOLE FIRES IN THE SUBJECT VEHICLES MOST OFTEN OCCURRED WHILE VEHICLES EQUIPPED WITH THE LAMP OUTAGE MODULE (LOM), WHICH IS PART OF THE MESSAGE CENTER, WERE TOWING A TRAILER AND WHICH HAD BEEN MODIFIED BY ADDING AN AFTERMARKET TRAILER WIRING HARNESS INTO THE VEHICLE'S TAILLIGHT CIRCUITS.THE OWNER'S MANUAL STATES NEVER AND MORE THAN OTHER TRAILER LIGHT BULB TO ONE CIRCUIT HOWEVER TRAILERS FREQUENTLY CONTAIN SEVERAL BULBS.THE RESULTING EXCESS CURRENT PASSING THROUGH THE LOM COULD CAUSE IT TO OVERHEAT RESULTING IN A FIRE.PROPER AFTERMARKET INSTALLATION OF TRAILER WIRING REQUIRES THE USE OF A BYPASS MODULE, WHICH OBTAINS POWER FOR THE TRAILER LIGHTS DIRECTLY FROM THE BATTERY RATHER THAN FROM THE VEHICLE'S TAIL LIGHT AND STOP LAMP CIRCUITS, OR THE USE OF THE MANUFACTURER'S WIRING HARNESS.IN A LETTER DATED SEPTEMBER 2, 1997, FORD NOTIFIED ODI THAT IT INTENDS TO TAKE ACTION TO PRECLUDE FURTHER INCIDENTS INCLUDING ISSUING A TECHNICAL SERVICE BULLETIN TO ITS DEALERS, NOTIFYING TRAILER RENTAL ASSOCIATIONS AND AGENCIES WHERE KNOWN, AND ADVISING OWNERS BY LETTER OF THE PROPER METHOD FOR CONNECTION OF TRAILER TOW WIRING ON THE SUBJECT VEHICLES.THERE WAS NO DEFECT TREND IN THE SUBJECT VEHICLES IDENTIFIED AS A RESULT OF THIS INVESTIGATION, AND FURTHER EXPENDITURE OF AGENCY RESOURCES IS NOT WARRANTED TO CONTINUE THE INVESTIGATION.

THE CONTACT ASSEMBLY FOR THE REMOTE POWER MIRROR CONTROL SWITCH MAY DEVELOP A SHORT CIRCUIT BETWEEN THE SWITCH POSITIVE PAD AND CHASSIS GROUND PAD AS A RESULT OF WATER INTRUSION.EXCESS CURRENT FLOW RESULTING FROM THE SHORT CIRCUIT CONDITION MAY OVERHEAT THE REMOTE POWER MIRROR CONTROL SWITCH CIRCUIT BOARD AND CAUSE A FIRE IN THE DRIVER'S DOOR.FORD HAS INDICATED THAT CURRENT IN EXCESS OF 15 AMPS CAN OVERHEAT THE CIRCUIT BOARD ENOUGH TO CAUSE A FIRE.CIRCUIT PROTECTION IS PROVIDED BY A 30 AMP FUSE.FORD IS RECALLING ALL 1993-94 4-DOOR EXPLORER VEHICLES EQUIPPED WITH THE SUBJECT ELECTRONIC OPTION COMBINATION TO INSTALL AN IN-LINE 10 AMP FUSE IN THE POSITIVE BATTERY FEED TO THE REMOTE POWER MIRROR CONTROL SWITCH ASSEMBLY.NO 2-DOOR EXPLORER VEHICLES WERE BUILT WITH THE SUBJECT COMPONENTS.ACCORDING TO FORD, VEHICLES BUILT PRIOR TO THE RECALL PRODUCTION RANGE WERE EQUIPPED WITH LOWER CAPACITY CIRCUIT BOARDS FOR THE SUBJECT SWITCH ASSEMBLY THAT WOULD FAIL FROM AN OPEN CIRCUIT IF A SIMILAR SHORT OCCURRED.A NEW SWITCH ASSEMBLY WITH 10 AMP FUSE PROTECTION WAS INTRODUCED BEGINNING WITH THE 1995 MODEL YEAR EXPLORER.MAZDA WILL CONDUCT A PARALLEL COMPAIGN (97V-083.002) TO REMEDY THE SUBJECT CONDITION IN APPROXIMATELY 14,000 NAVAJO VEHICLES.THE NAVAJO VEHICLES WERE AVAILABLE IN ONLY THE 2-DOOR VERSION WHICH, UNLIKE THE EXPLORER VEHICLES, DID USE THE SUBJECT OPTION COMBINATION IN THAT BODY STYLE.

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