{"product_id":"2517604c1-oem-international®-def-quality-sensor-10-6-15-9-25-qls","title":"2517604C1 | OEM International® Def quality sensor, 10.6\/15.9\/25 Qls","description":"\u003cp\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e: Def Sensor, Def quality sensor 10.6\/15.9\/25.2g\u003cbr\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e: New\u003cbr\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e: International\u003cbr\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e: 2517604C1\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVehicle Fitment\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp\u003ePart number is an OEM fitment for medium- and heavy-duty International \/ Navistar commercial trucks equipped with \u003cb\u003e10.6L, 15.9L, or 25L DEF tanks\u003c\/b\u003e:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eClass 8 Highway Trucks:\u003c\/b\u003e International ProStar, LT Series, RH Series, LoneStar.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eVocational \u0026amp; Regional Trucks:\u003c\/b\u003e International WorkStar, HV Series, HX Series, MV Series, DuraStar.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eBuses \u0026amp; Commercial Chassis:\u003c\/b\u003e IC Bus platforms with SCR emissions control systems.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCompatible Engine Platforms:\u003c\/b\u003e Cummins ISX15 \/ X15, Cummins L9 \/ B6.7, and Navistar N13 \/ A26 engines.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe \u003cb\u003eDEF Quality, Level \u0026amp; Temperature Header Assembly\u003c\/b\u003e is an all-in-one emissions control module engineered for \u003cb\u003e10.6, 15.9, and 25-liter Diesel Exhaust Fluid (DEF) tanks\u003c\/b\u003e.\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp\u003e\u003cb\u003e1. What is it?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003ePart is a multi-function submerged header unit installed inside the DEF reservoir of medium- and heavy-duty trucks. It serves as the primary communication link between the DEF tank and the Engine Control Module (ECM) to keep Selective Catalytic Reduction (SCR) systems fully compliant with emissions standards.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e2. Integrated Functions \u0026amp; Key Features\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eQuality, Level \u0026amp; Temperature Sensing (QLS):\u003c\/b\u003e Utilizes digital ultrasonic sensor technology to measure DEF liquid level, continuously test urea concentration (ensuring 32.5% purity to prevent dilution), and monitor fluid temperature over the CAN-bus network.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eFluid Suction \u0026amp; Return Pipelines:\u003c\/b\u003e Heavy-duty pickup tubes transport DEF directly to the dosing pump and return excess fluid safely back to the tank.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eEngine Coolant Heating Loop:\u003c\/b\u003e Features an internal tube coil connected to the truck's engine cooling system to thaw frozen DEF (which solidifies at 12°F \/ -11°C) in cold weather.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eIn-Tank Protection:\u003c\/b\u003e Includes a fine mesh filter screen at the suction intake to catch debris and prevent damage to the downstream DEF pump.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSigns of Faulty\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp\u003e\u003cb\u003e1. Active Check Engine Light \u0026amp; Diagnostic Fault Codes\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eThe ECM logs specific SCR Diagnostic Trouble Codes (DTCs) when it loses communication with the integrated Quality, Level, and Temperature Sensor (QLS) or receives out-of-spec signals via the J1939 CAN network:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCommon Fault Codes:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003ccode\u003eSPN 1761 \/ FMI 9, 11, 19\u003c\/code\u003e (DEF Tank Level - Communication Error \/ Abnormal Rate of Change)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003ccode\u003eSPN 3364 \/ FMI 2, 9, 11\u003c\/code\u003e (DEF Quality - Abnormal Urea Concentration \/ Non-DEF Detected)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003ccode\u003eSPN 3031 \/ FMI 9, 11\u003c\/code\u003e (DEF Tank Temperature - Out of Range \/ Signal Invalid)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003ccode\u003eSPN 3868 \/ SPN 4572\u003c\/code\u003e (Navistar QLS Header Data Performance Faults)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003e2. Incorrect or Fluctuating DEF Level Readings\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSymptom:\u003c\/b\u003e The DEF gauge on the dashboard reads empty immediately after refilling a 10.6L, 15.9L, or 25L tank, stays permanently stuck at full, or fluctuates randomly while driving.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCause:\u003c\/b\u003e Failure of the internal float, degradation of the ultrasonic transducer, or fluid ingress shorting out the internal circuit board.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003e3. False \"Incorrect DEF\" Warnings \u0026amp; Engine De-rate\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSymptom:\u003c\/b\u003e The driver display triggers a \"Poor DEF Quality\" warning along with a countdown timer, eventually reducing vehicle speed (typically down to 55 mph and later to 5 mph).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCause:\u003c\/b\u003e Internal calibration drift causing the sensor to falsely report incorrect urea concentration (below the standard 32.5% ISO requirement) even when fresh, high-quality DEF is used.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003e4. Cold Weather Heating \u0026amp; Thawing Failures\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSymptom:\u003c\/b\u003e In freezing conditions, the vehicle logs SCR pressure codes (\u003ccode\u003eSPN 3556\u003c\/code\u003e) or tank thaw timeout errors because fluid remains frozen in the reservoir.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCause:\u003c\/b\u003e A faulty integrated temperature sensor sending incorrect liquid temperature readings to the ECM, or internal blockage within the coolant heating loop.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eManufacturer information\u003c\/strong\u003e\u003cbr\u003eNavistar® is a proud manufacturer of some of the widely used trucks, yellow school buses, defense vehicles, and engines. It was recognized as the first truck and engine manufacturer to be certified by the EPA for meeting 2007 standards for hydrocarbons and particulate matter. But the company's global portfolio is not limited to its line of vehicles and engines—it also carries high-quality replacement parts and accessories to keep all these working in top condition at all times. From hose fuel, bolts, plugs, rivets, and bearings to flashers, incandescent lamps, camshaft brake, gasket injector, and spring door locks, Navistar has also got you covered.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003cbr\u003eFirst Truck Parts offers a \u003cstrong\u003e365-days warranty\u003c\/strong\u003e for all types of parts and in any condition. The warranty applies only to buyers who have placed an order on our website.\u003c\/p\u003e","brand":"International","offers":[{"title":"Default Title","offer_id":49068432031988,"sku":"2517604C1","price":499.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/1479\/5764\/files\/4097728c91_b31516a6-887f-47e9-8c10-1544ce4bf3ab.png?v=1709504530","url":"https:\/\/firsttruckparts.com\/en-ca\/products\/2517604c1-oem-international%c2%ae-def-quality-sensor-10-6-15-9-25-qls","provider":"First Truck Parts","version":"1.0","type":"link"}