4097721C91 | Genuine OEM International/Navistar 5-Gal DEF Tank QLS Head 11"

The 4097721C91 DEF Tank QLS Head is listed for compatible 5-gallon Diesel Exhaust Fluid (DEF) tank applications and has a specified 11-inch head length. It is part of the DEF monitoring system used in vehicle emissions aftertreatment. Verify the original part number and tank configuration before ordering.

PRODUCT INFORMATION

Part Number: 4097721C91
Brand: International / Navistar
Condition: Genuine OEM — confirm the item's actual condition with the seller
Component: DEF Tank Quality Level Sensor Head
Tank Capacity: 5 Gallons
Head Length: 11 Inches
System: Diesel Exhaust Fluid (DEF) / SCR Aftertreatment System

APPLICATIONS

Designed for compatible International/Navistar vehicles equipped with a 5-gallon DEF tank using the specified 11-inch QLS sensor head. Exact vehicle and tank compatibility should be confirmed before purchase.

FUNCTION

The DEF tank QLS head helps monitor DEF tank conditions for the vehicle’s emissions aftertreatment system. Proper sensor operation supports reliable system monitoring and helps identify potential DEF-related issues.

SIGNS OF A FAULTY DEF TANK QLS HEAD

• Incorrect or inconsistent DEF level readings

• DEF quality warning on the dashboard

• DEF or aftertreatment system warning lights

• Diagnostic trouble codes related to DEF tank sensors

• Readings that do not correspond with the actual tank condition

• Emissions system warnings or related performance restrictions

WHY REPLACE THE DEF TANK QLS HEAD?

A faulty sensor head may cause inaccurate DEF monitoring and trigger system warnings or diagnostic codes. Replacing a defective component with the correct compatible part can help restore reliable tank monitoring.

FITMENT INFORMATION

Confirm that part number 4097721C91 matches your original component and DEF tank configuration. Sensor heads may differ in dimensions, connections, or vehicle applications.

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.

GENUINE INTERNATIONAL / NAVISTAR PART

Part Number: 4097721C91