{"product_id":"4097727c91-genuine-oem-international-def-qls-15-5g-23g-header","title":"4097727C91 | Genuine OEM International DEF QLS 15.5G\/23G Header","description":"\u003ch1\u003e\u003cspan\u003e4097727C91 | Genuine OEM International DEF QLS 15.5G\/23G Header\u003c\/span\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cspan\u003eThe Genuine OEM International \/ Navistar 4097727C91 DEF Quality Level Sensor (QLS) Header is designed for compatible commercial diesel trucks equipped with 15.5-gallon, 16-gallon, or 23-gallon Diesel Exhaust Fluid (DEF) tanks. This DEF tank header assembly monitors fluid level, quality, and temperature to support the vehicle's Selective Catalytic Reduction (SCR) emissions control system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDesigned for compatible International \/ Navistar applications, the 4097727C91 DEF header provides essential DEF system information to the vehicle's electronic controls, helping maintain 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 4097727C91\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 QLS\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 15.5, 16, and 23 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\u003eCommunication:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Digital Sensor Interface\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 original assembly\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 Heavy-Duty Commercial Diesel Trucks\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 Selected Cummins ISX15 \/ X15 and Navistar N13 configurations\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eVehicle Applications:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Selected International \/ Navistar trucks\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eOEM Service References:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 4254216C91, 4163695C91\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRemanufactured Reference:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 5012174R91\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFitment Period:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Selected 2017–2024 applications; verify by VIN\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 4097727C91 DEF 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 ProStar\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eSelected International \/ Navistar Heavy-Duty Trucks\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCommercial Trucks with 15.5-Gallon DEF Tanks\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCommercial Trucks with 16-Gallon DEF Tanks\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCommercial Trucks with 23-Gallon DEF Tanks\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eSelected Cummins ISX15 \/ X15 Diesel Engine Applications\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eSelected Navistar N13 Diesel Engine Applications\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eApplication catalogs reference selected 2017–2024 vehicles. The original International service documentation identifies the 4097727C91 header for applicable 2016-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 Tank capacity, engine model, and model year alone do not guarantee fitment. Confirm the original part number, tank configuration, sensor generation, connector, 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 4097727C91 DEF QLS Header is installed in the DEF tank and provides fluid-related information to the vehicle's emissions control system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe QLS sensor monitors DEF level, quality, and temperature. This information helps the electronic control system identify DEF supply conditions and support proper operation of the SCR emissions system, which reduces nitrogen oxide (NOx) emissions.\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 system warning lights\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDEF sensor communication 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\u003eDEF temperature readings becoming inaccurate or unavailable\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 receiving accurate DEF information.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eReplacing a defective header with the correct Genuine OEM International 4097727C91 component helps restore intended DEF level, quality, and temperature monitoring.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eProper DEF header operation supports reliable SCR system diagnostics and helps prevent operating restrictions caused by faulty sensor information.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eFITMENT INFORMATION\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe International 4097727C91 DEF QLS Header requires verification of the complete 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: 4097727C91\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDEF Tank Capacity: 15.5, 16, or 23 Gallons\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eVehicle make, model, and model year\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eEngine model and emissions configuration\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDEF header sensor generation and calibration\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eElectrical connector and wiring compatibility\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\u003eSensor insertion length and tank depth\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDEF suction, return, 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\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eApplicable International \/ Navistar service replacement information\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 the vehicle manufacturer's service procedures. Protect the DEF system from contamination, verify all electrical and fluid connections, and confirm 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 genuine replacement components for commercial diesel vehicles and emissions control systems.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Genuine OEM International 4097727C91 DEF QLS Header is intended for compatible DEF tank configurations, helping maintain accurate fluid 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":49967135785219,"sku":"SY1061","price":485.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0838\/9289\/6003\/files\/IMG_2047_9f03f62c-481c-4b45-8837-aa703a8a6192.jpg?v=1792771809","url":"https:\/\/truckpartsplanet.com\/es\/products\/4097727c91-genuine-oem-international-def-qls-15-5g-23g-header","provider":"TRUCK PARTS PLANET","version":"1.0","type":"link"}