{"product_id":"4254202c91-genuine-oem-international-def-qls-header-15-5g-23g","title":"4254202C91 | Genuine OEM International DEF QLS Header 15.5G\/23G","description":"\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e4254202C91 | Genuine OEM International\/Navistar DEF QLS Header 15.5G\/23G\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe 4254202C91 Genuine OEM International\/Navistar Diesel Exhaust Fluid (DEF) QLS Header is a tank-mounted component designed for compatible DEF systems. The header assembly supports monitoring of DEF tank conditions, helping the vehicle's emissions control system operate according to its design.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003ePRODUCT INFORMATION\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\u003cspan\u003ePart Number: 4254202C91\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eBrand: International \/ Navistar\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCondition: Genuine OEM — confirm the item's actual condition with the seller\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eComponent: Diesel Exhaust Fluid (DEF) QLS Header\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSystem: DEF \/ SCR Emissions System\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTank Applications: 15.5-gallon and 23-gallon DEF tanks, subject to fitment verification\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eAPPLICATIONS\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThis DEF QLS Header is listed for compatible 15.5-gallon and 23-gallon DEF tank configurations. Exact compatibility depends on the vehicle model, model year, tank capacity, electrical connections, and original part number. Verify the application before ordering, as different DEF header assemblies may not be interchangeable.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eFUNCTION\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe DEF QLS Header is installed in the DEF tank assembly and supports monitoring of fluid conditions, such as level, quality, and temperature, depending on the specific configuration. These signals help the vehicle's emissions control system manage diesel exhaust fluid operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eSIGNS OF A FAULTY DEF QLS HEADER\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eA faulty DEF header or related system issue may cause:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\u003cspan\u003eDEF level readings that are incorrect or inconsistent\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDEF quality or temperature sensor fault codes\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCheck engine or emissions system warning lights\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSCR system warnings or fault messages\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDEF system performance or communication issues\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eEmissions-related derate warnings on applicable vehicles\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThese symptoms may also result from wiring faults, contaminated DEF, connector problems, or other emissions system components. Proper diagnostics are recommended before replacing the header.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eWHY REPLACE THE DEF QLS HEADER?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eReplacing a confirmed faulty DEF QLS Header with the correct compatible unit can help restore accurate tank monitoring and normal DEF system operation. Depending on the vehicle, fault-code clearing, system checks, or additional diagnostic procedures may be required after installation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eFITMENT INFORMATION\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eVerify that part number 4254202C91 matches the original DEF header before ordering. Compatibility depends on the vehicle model year, DEF tank capacity, connector type, and system configuration. Tank capacity alone is not sufficient to confirm fitment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIf you are unsure whether this part is correct for your vehicle, please contact us with your VIN and original DEF header part number. We are happy to help verify compatibility before purchase.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eGENUINE INTERNATIONAL \/ NAVISTAR PART\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePart Number: 4254202C91\u003c\/span\u003e\u003c\/p\u003e","brand":"INTERNATIONAL\/NAVISTAR","offers":[{"title":"Default Title","offer_id":49887916785923,"sku":"SY1061","price":475.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0838\/9289\/6003\/files\/QLS_DEF_Tank_Sensor.jpg?v=1791214445","url":"https:\/\/truckpartsplanet.com\/products\/4254202c91-genuine-oem-international-def-qls-header-15-5g-23g","provider":"TRUCK PARTS PLANET","version":"1.0","type":"link"}