4163689C91 | Genuine International® / Navistar® Diesel Exhaust Fluid (DEF) Tank QLS Head 11" 5 Gall

SKU: 4163689C91 MPN: 4163689C91

Cold starts, steep grades, long hauls — this Genuine International / Navistar DEF QLS Head keeps readings stable under stress. Part number: 4163689C91. Condition: new. Built for 5-gallon heated tanks with precise suction control.

$379.00
No Core Charge
3 in stock

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Contact us to check if overnight next-day delivery is available for your order - PN: 4163689C91

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Product Description

Product Name Diesel Exhaust Fluid (DEF) Tank Head Product Name Diesel Exhaust Fluid (DEF) Tank Head
Condition New Condition New
Brand International® / Navistar® Brand International® / Navistar®
Part Number 4163689C91 Part Number 4163689C91
Specifications
Sensor Type QLS Sensor Type QLS
Electrical Connector Deutsch DT4 (STD) Electrical Connector Deutsch DT4 (STD)
Sensor Type Digital (canbus) Sensor Type Digital (canbus)
DEF Header Height (IN) 11 DEF Header Height (IN) 11
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:

This New Genuine International / Navistar DEF Tank QLS Head, supplied under Part number: 4163689C91, functions as a full monitoring and suction module for 5-gallon heated DEF tanks with a 6-bolt mounting design. Its digital Canbux sensor tracks both fluid quality and level, while the 40µ internal filter protects the SCR system from contaminants.

Why Replacement is Important:

Faulty QLS heads may transmit inaccurate readings, block suction flow, or fail to heat the tank, resulting in DEF warnings and emission shutdowns. Installing a new unit restores clean filtration and accurate sensor reporting.

Impact on Vehicle Performance:

Consistent DEF flow and sensor data allow the SCR system to maintain full performance, prevent derates, and reduce unnecessary service downtime associated with DEF system errors.

Manufacturer Information: 

International® provides durable parts built for consistent operation in demanding fleet environments.

Navistar® produces parts engineered for efficiency, reduced maintenance, and dependable fleet operation.

Tags & Category: DEF Tank Head, DEF QLS Head, Diesel Exhaust Fluid Tank Module, DEF Sensor Head, DEF Level Sensor, DEF Quality Sensor, DEF Suction Module, Coolant-Heated DEF Header, International DEF System, Navistar Emissions Component, Deutsch DT4 Connector, Digital CANBUS Sensor, 5 Gallon DEF Tank, 11 Inch DEF Header, 3/8 SAE J2044 Suction, 5/16 SAE J2044 Return, 5/8 Hose Bead Coolant Ports, 40 Micron DEF Filter, 6 Bolt Tank Interface

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: 4163689C91