4254201C91 | Genuine International® / Navistar® 9.5 Gallon Def Tank QLS Sensor Head

SKU: 4254201C91 MPN: 4254201C91

Dominate DEF accuracy with the Genuine International / Navistar QLS Sensor Head. Part number: 4254201C91. Condition: new. Engineered for 9.5-gallon tanks with digital precision and a secure flange-mount design built for heavy duty cycles.

$469.00
No Core Charge
3 in stock

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Product Description

Product Name 9.5 Gallon Def Tank Qls Sensor Head Product Name 9.5 Gallon Def Tank Qls Sensor Head
Condition New Condition New
Brand International® / Navistar® Brand International® / Navistar®
Part Number 4254201C91 Part Number 4254201C91
Type Level Sensor Type Level Sensor
Vehicle Compatibility
International 7300 Severe Service (built on or after 10/01/2001) International 7300 Severe Service (built on or after 10/01/2001)
International 7400 Severe Service (built on or after 07/01/2001) International 7400 Severe Service (built on or after 07/01/2001)
International 7500 Severe Service (built on or after 07/01/2001) International 7500 Severe Service (built on or after 07/01/2001)
International 7600 Severe Service (built on or after 04/01/2002) International 7600 Severe Service (built on or after 04/01/2002)
International 5900i Severe Service Conventional International 5900i Severe Service Conventional
International HV Series with Medium Duty Engines International HV Series with Medium Duty Engines
International HV Series with Heavy Duty Engines International HV Series with Heavy Duty Engines
International LoneStar Linehaul Conventional International LoneStar Linehaul Conventional
International ProStar Linehaul Conventional International ProStar Linehaul Conventional

Useful Information

Description and Purpose:

Part number: 4254201C91 is a new Genuine International / Navistar DEF Tank QLS Sensor Head built specifically for 9.5-gallon systems. Instead of simply “reading the tank,” this flange-mounted unit constantly evaluates DEF purity and accurate fluid level before the system even considers dosing. It communicates digitally through the QLS interface, keeping the SCR system from guessing and relying on precise data instead.

Why Replacement is Important:

When the sensor begins sending slow or distorted signals, the vehicle assumes DEF can’t be trusted and limits performance, even if the tank is full and clean.

Impact on Vehicle Performance:

With proper readings restored, the ECM stops restricting the engine, torque remains available, and the emission system works at full efficiency without unnecessary derates.

Manufacturer Information:

International® produces engineered components that prioritize uptime and serviceability, helping fleets maintain productivity in demanding commercial operations.

Navistar® designs durable parts and systems focused on operational reliability, fuel efficiency, and long-term fleet performance.

Tags & Category: DEF Sensor Units, DEF Tank Components, Heavy-Duty Truck Part, Commercial Vehicle Emission Control, International DEF Sensor, Severe Service Truck Component, QLS Sensor.

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: 4254201C91