{"product_id":"2523589c91-genuine-oem-international-navistar-7-gal-def-header-qls-1-ssi","title":"2523589C91 | Genuine OEM International\/Navistar 7-Gal DEF Header QLS 1% SSI","description":"\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cstrong\u003e2523589C91 | Genuine OEM International\/Navistar 7-Gal DEF Header QLS 1% SSI\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe 2523589C91 DEF Header is a genuine OEM International\/Navistar component designed for compatible 7-gallon diesel exhaust fluid (DEF) tank systems. This header is specified with QLS (Quality Level Sensor) and 1% SSI features for monitoring DEF-related system conditions. Verify the original part number, tank capacity, and sensor configuration before ordering.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePRODUCT INFORMATION\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePart Number: 2523589C91\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBrand: International \/ Navistar\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCondition: Genuine OEM — confirm the item's actual condition with the seller\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eComponent: DEF Header\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTank Capacity: 7 Gallons\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSensor Type: QLS\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSpecification: 1% SSI\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSystem: Diesel Exhaust Fluid (DEF) \/ SCR Aftertreatment System\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAPPLICATIONS\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDesigned for compatible International\/Navistar vehicles equipped with the matching 7-gallon DEF tank and QLS header configuration. Exact vehicle models, engine applications, and production years should be verified before purchase.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFUNCTION\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe DEF header is installed in the DEF tank and supports fluid-level and quality monitoring, depending on the specific configuration. Sensor information is used by the vehicle's emissions aftertreatment system to help manage DEF operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSIGNS OF A FAULTY DEF HEADER\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eIncorrect DEF level readings\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDEF quality warnings\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDEF system or aftertreatment warning lights\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eFault codes related to DEF sensor operation\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eInconsistent DEF level or quality readings\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eEmissions system performance warnings\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eThese symptoms may also be caused by wiring, connectors, contaminated DEF, or other aftertreatment components. Proper diagnosis is recommended before replacement.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWHY REPLACE THE DEF HEADER?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA damaged or malfunctioning DEF header may provide inaccurate sensor readings or interfere with normal DEF system monitoring. Replacing a confirmed faulty component with the correct compatible header can help restore proper system operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFITMENT INFORMATION\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePart Number: 2523589C91\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBrand: International \/ Navistar\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eComponent: DEF Header\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTank Capacity: 7 Gallons\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSensor Configuration: QLS, 1% SSI\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eConfirm the part number, tank capacity, connector, and sensor configuration against the original unit before purchase. If you are unsure whether this part is correct for your vehicle, please contact us with your VIN and original part number. We are happy to help verify compatibility before purchase.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGENUINE INTERNATIONAL \/ NAVISTAR PART\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePart Number: 2523589C91\u003c\/span\u003e\u003c\/p\u003e","brand":"INTERNATIONAL\/NAVISTAR","offers":[{"title":"Default Title","offer_id":49939356156163,"sku":"SY1058","price":759.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0838\/9289\/6003\/files\/DEF_Sensor_Detail.webp?v=1792699563","url":"https:\/\/truckpartsplanet.com\/es\/products\/2523589c91-genuine-oem-international-navistar-7-gal-def-header-qls-1-ssi","provider":"TRUCK PARTS PLANET","version":"1.0","type":"link"}