4099717C91 | Genuine OEM International/Navistar DEF QLS Header 15.5–23G
The 4099717C91 Diesel Exhaust Fluid (DEF) QLS Header is a Genuine OEM International/Navistar component designed for compatible DEF tank systems. This header is intended for 15.5–23 gallon DEF tank applications and integrates sensing components used to monitor DEF system conditions.
PRODUCT INFORMATION
- Part Number: 4099717C91
- Brand: International/Navistar
- Condition: New
- Component: DEF QLS Header
- Fuel Type: Diesel
- DEF Tank Applications: 15.5–23 gallons
- System: Diesel Exhaust Fluid / SCR Aftertreatment
APPLICATIONS
- Compatible International/Navistar diesel truck applications
- 15.5-gallon DEF tank applications
- 23-gallon DEF tank applications
- Compatible DEF and SCR aftertreatment systems
Exact fitment depends on the vehicle, DEF tank configuration, sensor system, and original equipment specifications.
FUNCTION
The DEF QLS Header is installed in the DEF tank system and supports sensing and monitoring of diesel exhaust fluid conditions for the vehicle's SCR aftertreatment system.
A worn, damaged, or failing DEF QLS Header may cause symptoms such as:
- Incorrect DEF level readings
- DEF system warning messages
- SCR or aftertreatment fault codes
- DEF quality or sensor-related warnings
- Check engine or emissions warning indicators
- Incorrect DEF system information
WHY REPLACE A DEF QLS HEADER?
A properly functioning DEF header is important for accurate monitoring of the DEF tank and proper SCR system operation. Replacing a failed or damaged header can help restore correct DEF sensing and system communication.
FITMENT INFORMATION
Always verify the part number, VIN, vehicle model, DEF tank capacity, sensor configuration, and original equipment specifications before ordering. Exact compatibility may vary by application.
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: 4099717C91
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4099717C91 | Genuine OEM International DEF QLS Header 15.5–23G
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Return Within 30 Days
- The item can be returned within 30 days from the date of receipt.
- Not satisfied? Contact us by email or phone for return instructions or exchange.
Shipping Terms
- Enjoy free shipping on orders over $199.
- Orders placed before 7:00 PM (EST) are shipped the same day.
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