{"product_id":"4097728c91-genuine-oem-international-def-qls-header","title":"4097728C91 | Genuine OEM International DEF QLS Header","description":"\u003ch1\u003e\u003cspan\u003e4097728C91 | Genuine OEM International DEF QLS Header\u003c\/span\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cspan\u003eThe Genuine OEM International \/ Navistar 4097728C91 DEF Quality Level Sensor (QLS) Header is designed for compatible commercial diesel trucks equipped with 10.6-gallon, 15.9-gallon, or 25.2-gallon Diesel Exhaust Fluid (DEF) tanks. This ultrasonic DEF tank header monitors fluid conditions and communicates important information to the vehicle's emissions control system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAs part of the Selective Catalytic Reduction (SCR) system, the DEF QLS header helps maintain accurate DEF monitoring and supports proper emissions system operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003ePRODUCT INFORMATION\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePart Number:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 4097728C91\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBrand:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e International \/ Navistar\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCondition:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Not specified\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eComponent:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e DEF Quality Level Sensor Header\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePart Type:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e DEF Tank Head Unit \/ QLS Sensor Assembly\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSensor Technology:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Ultrasonic\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTank Capacities:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 10.6 \/ 15.9 \/ 25.2 Gallons\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSystem:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Diesel Exhaust Fluid (DEF) \/ Selective Catalytic Reduction (SCR)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSensor Functions:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e DEF Level, Quality, and Temperature Monitoring\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eInstallation Location:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e DEF Tank\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eApplication:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Commercial Diesel Trucks\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eEmissions Application:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Selected 2017 and newer federal emissions configurations\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFuel Type:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Diesel\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eEngine Applications:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Vehicle- and emissions-system-specific\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eElectrical Connector:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Verify against the original assembly\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eMounting Configuration:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Verify against the original DEF tank\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRelated Service References:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 4140918C91, 4254210C91, 2517604C1\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eKit Contents:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Verify against the actual product\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan\u003eAPPLICATIONS\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe International 4097728C91 DEF QLS Header is intended for compatible International \/ Navistar commercial vehicles equipped with the appropriate DEF tank and SCR emissions system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePotential applications include:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eInternational \/ Navistar Heavy-Duty Trucks\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eInternational Commercial Diesel Vehicles\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eSelected Medium-Duty Diesel Trucks\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eVehicles with Compatible 10.6-Gallon DEF Tanks\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eVehicles with Compatible 15.9-Gallon DEF Tanks\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eVehicles with Compatible 25.2-Gallon DEF Tanks\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eSCR Emissions Systems Requiring OEM Part Number 4097728C91\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eInternational service documentation identifies this part for selected 2017 and newer federal emissions configurations.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eImportant:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e DEF tank capacity alone does not guarantee compatibility. Verify the original OEM part number, sensor generation, tank depth, mounting arrangement, electrical connections, and vehicle VIN before purchasing.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eFUNCTION\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe International 4097728C91 DEF QLS Header monitors Diesel Exhaust Fluid conditions inside the vehicle's DEF tank.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe ultrasonic sensing system provides DEF level, quality, and temperature information used by the electronic control system to support SCR operation and emissions diagnostics.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA worn, damaged, or failing DEF QLS header may cause symptoms such as:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eIncorrect or fluctuating DEF level readings\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDEF quality or concentration warning messages\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCheck engine or SCR warning lights\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDEF sensor communication faults or diagnostic trouble codes\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eEmissions-related engine power derating\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eMissing or inaccurate DEF temperature information\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan\u003eWHY REPLACE A DEF QLS HEADER?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eA malfunctioning DEF quality level sensor can prevent the vehicle's emissions control system from accurately monitoring DEF conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eReplacing a defective sensor with the correct Genuine OEM International 4097728C91 DEF QLS Header helps restore intended fluid monitoring and communication with the SCR system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eProper DEF sensor operation supports accurate emissions diagnostics, reliable DEF level reporting, and the correct operation of the vehicle's emissions control strategy.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eFITMENT INFORMATION\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe International 4097728C91 DEF QLS Header requires careful verification of the original DEF tank and emissions system configuration.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBefore purchasing, confirm:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eOriginal OEM Part Number: 4097728C91\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDEF Tank Capacity: 10.6, 15.9, or 25.2 Gallons\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eTruck make, model, and model year\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eFederal emissions year and SCR system configuration\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDEF sensor generation and calibration\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eSensor length and tank depth\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eElectrical connector and wiring configuration\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eTank mounting interface\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDEF fluid line and coolant connection arrangement\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eVehicle Identification Number (VIN)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eIf you are unsure whether this DEF header fits your truck, please contact us with your VIN, truck model, model year, DEF tank capacity, and original part number before ordering.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eInstallation Note:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e DEF header replacement should follow International \/ Navistar service procedures. Prevent contamination of the DEF system, verify all electrical and fluid connections, and check sensor communication and SCR system operation after installation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eGENUINE INTERNATIONAL PART\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eInternational \/ Navistar supplies replacement components for commercial diesel vehicles and emissions control systems.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Genuine OEM International 4097728C91 DEF QLS Header is intended for compatible DEF tank applications, helping maintain accurate DEF monitoring and proper SCR system operation when correctly matched and installed.\u003c\/span\u003e\u003c\/p\u003e","brand":"International \/ Navistar","offers":[{"title":"Default Title","offer_id":49967285076227,"sku":"SY1062","price":300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0838\/9289\/6003\/files\/IMG_2048_b8a55725-44c9-4873-88c1-a331b6d30051.jpg?v=1792772494","url":"https:\/\/truckpartsplanet.com\/es\/products\/4097728c91-genuine-oem-international-def-qls-header","provider":"TRUCK PARTS PLANET","version":"1.0","type":"link"}