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2017 Ford Explorer

Owner reports · Recalls · Investigations

More warning signs than most Explorer years

Owner complaints for the 2017 Ford Explorer are substantially higher than the model-year median of 609.

About this comparison →

When problems were reported

Mileage at the reported incident

849 reports with mileage · 841 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.

  • Structure. Review the 655 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Engine. Review the 237 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Power Train. Review the 123 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →

NHTSA owner reports · September 18, 2026 snapshot.

34 crash reports11 fire reports36 injury reports

Back Over Prevention complaints

7 reports
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Mileage unknown · Aug 31, 2026
Air BagsBack Over PreventionForward Collision Avoidance

Benoit Nissan in DeRidder, LA, was contracted to perform a critical safety repair/recall on my vehicle's airbag system. The dealership charged for the completed repair, but explicitly aborted the physical installation, leaving the vehicle's Supplemental Restraint System (SRS) incomplete, non-functional, and hazardous. They attem…

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Benoit Nissan in DeRidder, LA, was contracted to perform a critical safety repair/recall on my vehicle's airbag system. The dealership charged for the completed repair, but explicitly aborted the physical installation, leaving the vehicle's Supplemental Restraint System (SRS) incomplete, non-functional, and hazardous. They attempted to return the vehicle to me with the air bag safety system compromised, creating an immediate, severe physical risk to occupants in the event of a crash. This involves deliberate service manipulation of a federally mandated safety device. They have a proven record of deceitful operations of criminal negligence and felony theft

NHTSA ODI #11760842

Mileage unknown · Mar 8, 2026
Back Over Prevention

Rear camera view is completely distorted when in use During times of rain, car wash or high humidity

NHTSA ODI #11722780

Mileage unknown · Oct 9, 2025
Back Over PreventionElectrical SystemEngine

Ya me marco el funcionamiento del motor

NHTSA ODI #11692240

140,000 miles · Mar 20, 2024
Back Over Prevention

The contact owns a 2017 Ford Explorer. The contact stated that upon shifting the vehicle into reverse, he became aware that the center screen failed to display a rearview, potentially compromising the back-over prevention system. No warning lights were illuminated. The vehicle was taken to the dealer, who diagnosed a failure wit…

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The contact owns a 2017 Ford Explorer. The contact stated that upon shifting the vehicle into reverse, he became aware that the center screen failed to display a rearview, potentially compromising the back-over prevention system. No warning lights were illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the APIM. The vehicle was repaired. The manufacturer was notified of the failure but did not assist. The failure mileage was 140,000.

NHTSA ODI #11578506

Mileage unknown · Mar 18, 2024
Back Over Prevention

in 2019 with 55,000 miles on my 2017 Ford Explorer limited the screen which displays the front and rear cameras stopped working. after taking in for repair we had to replace the APIM module. then last week our 2018 Ford fusion with 35,000 miles had the same part fail. upon further research it appears that there are alot of For…

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in 2019 with 55,000 miles on my 2017 Ford Explorer limited the screen which displays the front and rear cameras stopped working. after taking in for repair we had to replace the APIM module. then last week our 2018 Ford fusion with 35,000 miles had the same part fail. upon further research it appears that there are alot of Fords that have had the same problem. I'm filing this complaint because I believe Ford should be held responsible for making faulty parts.

NHTSA ODI #11577976

Mileage unknown · Jun 15, 2022
Back Over PreventionElectrical SystemPower TrainCrash

I backed into a parking spot, put the car in park and turned the vehicle off. As I was getting ready to get out of the car, it rolled backwards into another car parked to my passenger side rear. My vehicle did not give any warning, no sensor alert, or anything!

NHTSA ODI #11469449

Mileage unknown · Sep 1, 2021
Back Over PreventionElectrical SystemVehicle Speed Control

The APIM is malfunction in my 2017 explorer. Accessories stay on after vehicle turned off, killed battery, vehicle collision sensors and camera intermediate malfunction. Cruise control intermittent function, GPS and screen options /operations inoperable

NHTSA ODI #11431391

Official recalls

13

26V448000 · Structure:body

Jul 14, 2026

Ford Motor Company (Ford) is recalling certain 2016-2019 Explorer vehicles. The roof rail covers may come loose and detach from the vehicle.

Consequence & remedy

Consequence: A detached roof rail cover can create a road hazard, increasing the risk of a crash.

Remedy: Dealers will inspect the roof rail covers and as necessary, repair or replace the push-pins, rail clips, or roof rail covers, free of charge. Interim letters, notifying owners of the safety risk, were mailed August 28, 2026. Additional letters will be sent once the remedy is available, anticipated in January 2027. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 26S54. This recall expands previous NHTSA recall number 21V316. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on July 16, 2026.

26V101000 · Suspension:rear

Feb 20, 2026

Ford Motor Company (Ford) is recalling certain 2017-2019 Explorer vehicles. The rear suspension toe links may fracture.

Consequence & remedy

Consequence: A rear toe link fracture can result in a loss of steering control, increasing the risk of a crash.

Remedy: Dealers will replace the toe links, free of charge. Owner notification letters were mailed on March 16, 2026. Owners may contact Ford Customer Service at 1-866-436-7332. Ford's number for this recall is 26S08. This recall is an expansion of previous NHTSA recall number 21V537. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning February 25, 2026.

25V685000 · Equipment:electrical:engine Block Heater

Oct 10, 2025

Ford Motor Company (Ford) is recalling certain 2016-2019 Lincoln MKC, 2016-2023 Explorer, 2019-2020 Fusion, 2019-2024 Ranger, 2020-2022 Lincoln Corsair, Escape, 2021-2024 Bronco, Bronco Sport, and 2022-2024 Maverick vehicles. The engine block heater may crack and develop a coolant leak, causing it to short circuit when the block heater is plugged in.

Consequence & remedy

Consequence: An electrical short circuit can increase the risk of a fire.

Remedy: Owners are advised not to plug in their block heater until the vehicle is remedied. Dealers will replace the block heater, free of charge. Owners will also have a alternative option to replace engine block heater element with a threaded blanking plug, and remove the block heater electrical cord. Interim letters, notifying owners of the safety risk, were mailed December 3, 2025. Additional letters will be sent once the final remedy is available, anticipated September 2026. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 25SA4. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on October 15, 2025.

25V347000 · Structure:body

May 23, 2025

Ford Motor Company (Ford) is recalling certain 2016-2017 Explorer vehicles. The driver and front passenger B-Pillar door trim may detach while driving.

Consequence & remedy

Consequence: Door trim that detaches while driving can create a road hazard, increasing the risk of a crash.

Remedy: Dealers will repair the B-pillar trim, free of charge. Interim letters, notifying owners of the safety risk, were mailed June 5, 2025. A second notice will be sent once the final remedy is available, anticipated November 2026. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 25S53.

24V031000 · Structure:body:roof And Pillars

Jan 19, 2024

Ford Motor Company (Ford) is recalling certain 2011-2019 Explorer vehicles. The A-pillar trim retention clips may not be properly engaged, allowing the trim to detach.

Consequence & remedy

Consequence: A detached trim piece can fall off the vehicle, becoming a road hazard and increasing the risk of a crash.

Remedy: Dealers will inspect and replace the A-pillar trim as necessary, free of charge. This will be a phased campaign, with the remedy becoming available in different phases based on model years. Owner notification letters were mailed between July 18, 2024 and December 16, 2025. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 24S02.

21V537000 · Suspension:rear

Jul 15, 2021

Ford Motor Company (Ford) is recalling certain 2013-2017 Explorer vehicles originally sold, or ever registered, in Connecticut, Delaware, Illinois, Indiana, Iowa, Kentucky, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, Virginia, West Virginia, Wisconsin, and the District of Columbia. Exposure to road salt can cause the cross-axis ball joint to corrode and seize, resulting in a fracture of the outboard section of the rear suspension toe link.

Consequence & remedy

Consequence: A rear toe-link fracture can result in a loss of steering control, increasing the risk of a crash.

Remedy: Dealers will inspect and replace as necessary, the cross-axis ball joint (CABJ) knuckle, and replace the rear suspension toe links, free of charge. This recall is an expansion of previous NHTSA recall numbers 16V-245, 19V-435, and 20V-675. Certain vehicles previously repaired will need to return for the new remedy. An interim notification letter notifying owners of the safety risk were mailed on September 10, 2021. Owner notification letters were mailed on March 16, 2022. Owners may contact Ford's customer service at 1-866-436-7332. Ford's number for this recall is 21S32.

21V316000 · Structure:body

May 5, 2021

Ford Motor Company (Ford) is recalling certain 2016-2019 Explorer vehicles. The retention pins could loosen and allow the roof rail covers to detach from the vehicle.

Consequence & remedy

Consequence: A detached roof rail cover can create a road hazard, increasing the risk of a crash.

Remedy: Dealers will install push-pins and replace any damaged rail clips and roof rail covers, as necessary, free of charge. The interim owner notification letter was mailed on June 22, 2021. Owner notification letters (remedy available) were mailed on October 1, 2021. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 21S22.

20V675000 · Suspension:rear

Mar 12, 2021

Ford Motor Company (Ford) is recalling certain 2013-2017 Explorer vehicles originally sold, or currently registered in Connecticut, Delaware, the District of Columbia, Illinois, Indiana, Iowa, Kentucky, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, Virginia, West Virginia, and Wisconsin that were previously repaired under a prior recall numbers 16V-245 or 19V-435. The outboard section of a rear suspension toe link may fracture.

Consequence & remedy

Consequence: A rear toe link fracture can result in a loss of steering control, increasing the risk of a crash.

Remedy: Ford will notify owners, and dealers will inspect the cross-axis ball joint (CABJ) knuckle attached to the rear suspension toe link and replace it as necessary, free of charge. The recall began November 27, 2020. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 20S62.

19V651000 · Seats

Sep 11, 2019

Ford Motor Company (Ford) is recalling certain 2017 Ford Explorer vehicles equipped with power front seats. The seat frames may have sharp edges.

Consequence & remedy

Consequence: Occupants my contact the sharp edges when reaching between the power front seat and center console, increasing their risk of injury.

Remedy: Ford will notify owners, and dealers will install protective tape on the exposed inside edge and tab of the power seat frames, free of charge. The recall began November 8, 2019. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 19S29.

19V435000 · Suspension:rear

Jun 10, 2019

Ford Motor Company (Ford) is recalling certain 2011-2017 Explorer vehicles. The rear suspension toe links may fracture due to stress on the rear suspension.

Consequence & remedy

Consequence: A fractured rear toe link will cause a sudden change in vehicle handling and increase the risk of a crash.

Remedy: Ford will notify owners, and dealers will replace the rear suspension toe links, and inspect both rear toe link ball joints, replacing the rear wheel knuckle(s), if necessary, free of charge. The recall began June 26, 2019. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 19S17.

17V530000 · Steering

Aug 28, 2017

Ford Motor Company (Ford) is recalling certain 2017 Explorer, Taurus and Police Interceptor Utility and Sedan vehicles. The steering gear heat shield fasteners may corrode, allowing the heat shield to detach.

Consequence & remedy

Consequence: If the heat shield detaches, the steering gear may overheat, increasing the steering effort required by the driver, especially at lower speeds, and increasing the risk of a crash.

Remedy: Ford will notify owners, and dealers to inspect and replace the heat shield fasteners as needed, free of charge. The recall began on September 13, 2017. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 17S23.

17V332000 · Seats; Seats:front Assembly:recliner

May 22, 2017

Ford Motor Company (Ford) is recalling certain 2017 Ford Explorer, F-150, F-250, F-350, F-450 and F-550 vehicles equipped with a manual driver's seat back recliner mechanism. In the event of a crash, the seat back frame may not restrain the occupant due to having inadequate welds. As such, these vehicles may not meet the requirements of Federal Motor Vehicle Safety Standard (FMVSS) numbers 202a, "Head Restraints" and 207, "Seating Systems."

Consequence & remedy

Consequence: If the occupant is not adequately restrained in the event of a crash, they have an increased risk of injury.

Remedy: Ford will notify owners, and dealers will inspect and, if necessary, replace the seat back frame, free of charge. The recall began on June 7, 2017. Owners may contact Ford at 1-866-436-7332. Ford's number for this recall is 17C08.

Additional source detail variants (2)

Seats:front Assembly:recliner

Ford Motor Company (Ford) is recalling certain 2017 Ford Explorer, F-150, F-250, F-350, F-450 and F-550 vehicles equipped with a manual driver's seat back recliner mechanism. In the event of a crash, the seat back frame may not restrain the occupant due to having inadequate welds. As such, these vehicles may not meet the requirements of Federal Motor Vehicle Safety Standard (FMVSS) numbers 202a, "Head Restraints" and 207, "Seating Systems."

Consequence: If the occupant is not adequately restrained in the event of a crash, they have an increased risk of injury.

Remedy: Ford will notify owners, and dealers will inspect and, if necessary, replace the seat back frame, free of charge. The recall began on June 7, 2017. Owners may contact Ford at 1-866-436-7332. Ford's number for this recall is 17C08.

Seats

Ford Motor Company (Ford) is recalling certain 2017 Ford Explorer, F-150, F-250, F-350, F-450 and F-550 vehicles equipped with a manual driver's seat back recliner mechanism. In the event of a crash, the seat back frame may not restrain the occupant due to having inadequate welds. As such, these vehicles may not meet the requirements of Federal Motor Vehicle Safety Standard (FMVSS) numbers 202a, "Head Restraints" and 207, "Seating Systems."

Consequence: If the occupant is not adequately restrained in the event of a crash, they have an increased risk of injury.

Remedy: Ford will notify owners, and dealers will inspect and, if necessary, replace the seat back frame, free of charge. The recall began on June 7, 2017. Owners may contact Ford at 1-866-436-7332. Ford's number for this recall is 17C08.

16V925000 · Engine And Engine Cooling:engine:gasoline:turbo/supercharger

Dec 22, 2016

Ford Motor Company (Ford) is recalling certain model year 2016 Ford Taurus, 2016-2017 Ford Flex, Lincoln MKT, 2017 Ford Explorer and Ford Explorer Police Interceptor Utility vehicles equipped with 3.5L GTDI engines. Improperly brazed turbocharger oil supply tubes may leak oil on engine components.

Consequence & remedy

Consequence: An oil leak, in the presence of an ignition source, increases the risk of a fire.

Remedy: Ford will notify owners, and dealers will inspect, and if necessary, replace the turbocharger oil supply tubes, free of charge. The recall began on January 31, 2017. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 16S46.

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

PE23001 · Windshield Trim Molding Item Detachment

Opened Jan 27, 2023 · Closed Feb 8, 2024

Status: closed (inferred from source dates) · Structure:body:roof And Pillars

On January 27, 2023, the Office of Defects Investigation (ODI) opened PE23-001 to investigate allegations of A-pillar trim panel detachment on model year (MY) 2011-2019 Ford Explorer vehicles. At the time of opening, the office had received 164 Vehicle Owner Questionnaires (VOQs) reporting this failure. ODI has received 671 VOQs regarding this failure, including 1 alleged crash and 2 alleged injuries. Some consumers have reported that the failure occurred while they were driving at highway speeds, with the detached trim panel entering the path of travel of the vehicle behind them, requiring the driver of the following vehicle to take evasive action. It is noteworthy that motorists who experience this type of road hazard are less likely to accurately identify the subject vehicle the item detached from and report the event to the NHTSA. In its April 17, 2023 response to ODI’s information request, Ford provided 175 consumer complaints (including field reports) and 14,162 warranty claims related to A-pillar trim panel detachment. Ford relayed that the subject vehicles utilize a plastic A-pillar bracket, which is bolted to the vehicle structure during assembly. The A-pillar trim panel is attached to the bracket utilizing 7 plastic clips. Contributory factors which have been identified by Ford as leading to the subject defect include incomplete installation at the assembly plant, inadequate part stack up, damage to fasteners during installation, and failure to follow proper repair procedure during windshield replacements or other services. On January 19, 2024, Ford filed safety recall 24V-031 for MY 2011-2019 Ford Explorer vehicles to address the subject defect. In the Part 573 Safety Recall Report, Ford identified that a detached A-pillar trim panel can create a road hazard for other road users, increasing the risk of a crash. The recall remedy includes an inspection of the existing A-pillar trim panel and, if necessary, the replacement of the component. The remedy A-pillar trim panels will be installed with an additional adhesive for robustness and utilize an inspection procedure to ensure full engagement of all the retention clips during installation. In view of the recall action being taken by Ford, ODI is closing this Preliminary Evaluation. The agency reserves the right to take additional action if warranted by future circumstances. To review the reports cited in the Closing Resume ODI Report Identification Number document, go to NHTSA.gov.

EA17002 · Exhaust Odor In Passenger Cab

Opened Jul 27, 2017 · Closed Jan 17, 2023

Status: closed (inferred from source dates) · Engine And Engine Cooling:exhaust System:manifold/header/muffler/tail Pipe; Structure:body

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 the highest measured carbon monoxide levels in tested vehicles. The police FSA instructs how to inspect the quality of the vehicle upfits and how to properly seal any leaks caused by these upfits, at no cost to the police agency. Similarly, the highest CO levels measured in consumer vehicles were usually traced to sealing issues caused by rear crash damage where the repairs did not ensure sealing integrity. The most recent Ford FSA procedure for both the police (17B25) and consumer vehicles (17N03) includes an HVAC reprogramming operation. Tests by Ford and NHTSA have demonstrated a substantial reduction of CO levels due solely to the HVAC reprogramming. Other FSA repairs also demonstrated measurable contributions to CO level reductions during controlled tests.Throughout the investigation, vehicles accurately measured with higher levels of carbon monoxide were almost always affected by upfitter alterations, damage, or other causes compromising rear passenger cabin seals.NHTSA received thousands of reports alleging odors which triggered a variety of physiological responses, predominately nausea, headaches, and lightheadedness. NHTSA focused the investigation on accurately measuring vehicle CO levels, and accurately measuring carboxyhemoglobin (COHB) levels from properly administered blood tests. Using rigorous test methods to produce exhaust gas intrusion in vehicles with a properly performed FSA, occupant compartment CO levels remained below current environmental limits for CO in any environment (EPA ambient air quality standards). Furthermore, even without FSA repairs, no vehicles unaffected by upfitter issues or prior crash damage were identified with CO levels that exceed accepted occupational CO exposure levels. This investigation finds that the 2011-2017 Ford Explorer vehicles when accurately measured produce occupant compartment CO levels which fall below current accepted health standards, and could not identify COHB levels for vehicle drivers or other occupants, which exceeded thresholds for acute physiological effects. Therefore, the agency has not identified a defect that represents an unreasonable risk to motor vehicle safety.This inve

Additional source detail variants (2)

Engine And Engine Cooling:exhaust System:manifold/header/muffler/tail Pipe

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 the highest measured carbon monoxide levels in tested vehicles. The police FSA instructs how to inspect the quality of the vehicle upfits and how to properly seal any leaks caused by these upfits, at no cost to the police agency. Similarly, the highest CO levels measured in consumer vehicles were usually traced to sealing issues caused by rear crash damage where the repairs did not ensure sealing integrity. The most recent Ford FSA procedure for both the police (17B25) and consumer vehicles (17N03) includes an HVAC reprogramming operation. Tests by Ford and NHTSA have demonstrated a substantial reduction of CO levels due solely to the HVAC reprogramming. Other FSA repairs also demonstrated measurable contributions to CO level reductions during controlled tests.Throughout the investigation, vehicles accurately measured with higher levels of carbon monoxide were almost always affected by upfitter alterations, damage, or other causes compromising rear passenger cabin seals.NHTSA received thousands of reports alleging odors which triggered a variety of physiological responses, predominately nausea, headaches, and lightheadedness. NHTSA focused the investigation on accurately measuring vehicle CO levels, and accurately measuring carboxyhemoglobin (COHB) levels from properly administered blood tests. Using rigorous test methods to produce exhaust gas intrusion in vehicles with a properly performed FSA, occupant compartment CO levels remained below current environmental limits for CO in any environment (EPA ambient air quality standards). Furthermore, even without FSA repairs, no vehicles unaffected by upfitter issues or prior crash damage were identified with CO levels that exceed accepted occupational CO exposure levels. This investigation finds that the 2011-2017 Ford Explorer vehicles when accurately measured produce occupant compartment CO levels which fall below current accepted health standards, and could not identify COHB levels for vehicle drivers or other occupants, which exceeded thresholds for acute physiological effects. Therefore, the agency has not identified a defect that represents an unreasonable risk to motor vehicle safety.This inve

Structure:body

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 the highest measured carbon monoxide levels in tested vehicles. The police FSA instructs how to inspect the quality of the vehicle upfits and how to properly seal any leaks caused by these upfits, at no cost to the police agency. Similarly, the highest CO levels measured in consumer vehicles were usually traced to sealing issues caused by rear crash damage where the repairs did not ensure sealing integrity. The most recent Ford FSA procedure for both the police (17B25) and consumer vehicles (17N03) includes an HVAC reprogramming operation. Tests by Ford and NHTSA have demonstrated a substantial reduction of CO levels due solely to the HVAC reprogramming. Other FSA repairs also demonstrated measurable contributions to CO level reductions during controlled tests.Throughout the investigation, vehicles accurately measured with higher levels of carbon monoxide were almost always affected by upfitter alterations, damage, or other causes compromising rear passenger cabin seals.NHTSA received thousands of reports alleging odors which triggered a variety of physiological responses, predominately nausea, headaches, and lightheadedness. NHTSA focused the investigation on accurately measuring vehicle CO levels, and accurately measuring carboxyhemoglobin (COHB) levels from properly administered blood tests. Using rigorous test methods to produce exhaust gas intrusion in vehicles with a properly performed FSA, occupant compartment CO levels remained below current environmental limits for CO in any environment (EPA ambient air quality standards). Furthermore, even without FSA repairs, no vehicles unaffected by upfitter issues or prior crash damage were identified with CO levels that exceed accepted occupational CO exposure levels. This investigation finds that the 2011-2017 Ford Explorer vehicles when accurately measured produce occupant compartment CO levels which fall below current accepted health standards, and could not identify COHB levels for vehicle drivers or other occupants, which exceeded thresholds for acute physiological effects. Therefore, the agency has not identified a defect that represents an unreasonable risk to motor vehicle safety.This inve

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