2523590C91 | Genuine International® / Navistar® 12-Gal DEF Quality & Level Sensor Head Unit (QLS Module Assembly)

SKU: 2523590C91 MPN: 2523590C91

Stay confident on the road with the 12-Gal DEF Sensor Head Unit, from Genuine International/ Navistar, carrying Part Number: 2523590C91 and offered in Condition: New, designed to keep your truck’s DEF system running smoothly.

$649.00
No Core Charge
2 in stock

Need it fast? We offer overnight shipping

Contact us to check if overnight next-day delivery is available for your order - PN: 2523590C91

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    Orders before 7 PM EST ship same business day
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Product Description

Product Name DEF Quality & Level Sensor Head Unit Product Name DEF Quality & Level Sensor Head Unit
Condition New Condition New
Brand International® / Navistar® Brand International® / Navistar®
Part Number 2523590C91 Part Number 2523590C91
Engine Compatibility
International / Navistar N9, N10, N13, DT (2011-2016) International / Navistar N9, N10, N13, DT (2011-2016)
Tank Capacity Compatibility
Tank 12 Gallon Tank 12 Gallon
Specifications
Electrical Connector Deutsch DT4 (STD) Electrical Connector Deutsch DT4 (STD)
Sensor Type Digital (canbus) Sensor Type Digital (canbus)
DEF Header Height (IN) 18 DEF Header Height (IN) 18
DEF Suction Fitting Dia. (IN) 3/8 SAE J2044 DEF Suction Fitting Dia. (IN) 3/8 SAE J2044
DEF Return Fitting Dia. (IN) 5/16 SAE J2044 DEF Return Fitting Dia. (IN) 5/16 SAE J2044
Coolant Inlet Fitting Dia. (IN) 5/8 Hose Bead Coolant Inlet Fitting Dia. (IN) 5/8 Hose Bead
Coolant Outlet Fitting Dia. (IN) 5/8 Hose Bead Coolant Outlet Fitting Dia. (IN) 5/8 Hose Bead
In-Tank Filter 40µ In-Tank Filter 40µ
Tank Interface 6 Bolt Tank Interface 6 Bolt

Useful Information

Description and Purpose:

Genuine International/Navistar offer this new QLS Module Assembly, also known as the DEF Sensor Head Unit, Part number: 2523590C91, for heavy-duty trucks. Compatible with N9, N10, N13, and DT engines (2011–2016), it works with a 12-gallon DEF tank, delivering accurate diesel exhaust fluid measurements and supporting proper emissions system operation in commercial vehicles.

Why Replacement is Important:

Replacing a worn or faulty sensor prevents incorrect DEF readings and system alerts, ensuring emissions controls operate correctly without interruptions.

Impact on Vehicle Performance:

Accurate DEF monitoring maintains steady engine and exhaust operation, reducing the risk of derates and keeping trucks reliable on long hauls.

Manufacturer Information:

International® produces trucks engineered for durability and demanding conditions. 

Navistar® develops engines and components known for dependable, long-term performance in medium- and heavy-duty commercial fleets.

Tags & Category: 12-Gal DEF Quality & Level Sensor, DEF QLS Module Assembly, DEF Sensor Head Unit, Diesel Exhaust Fluid Level and Quality Sensor, SCR System DEF Sensor, DEF Tank Sensor Module, Diesel Emission Control Sensor, Heavy Duty Truck DEF Sensor, DEF Monitoring Module, QLS Sensor Assembly

Warranty:

Parts Finder Q offers a 365-days warranty for all types of parts in any condition. The -warranty applies exclusively to purchases made directly through our website (partsfinderq.com). Please note that purchases made through third-party platforms like eBay or Amazon are not covered by this warranty.

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  • Icon Truck, Fast Delivery
    Free shipping over $199 Place an order today and receive it on Mar 6
  • Clock Icon
    Orders placed before 7-PM EST will ship same business day
  • Location icon, warehouse pickup point.
    Pickup available usually ready in 24 hours
  • Need it fast? We offer overnight shipping

    Contact us to check if overnight next-day delivery is available for your order - PN: 2523590C91