4353001C91 | Genuine OEM International/Navistar DEF Header 7 Gallon QLS 1% SSI

The 4353001C91 Diesel Exhaust Fluid (DEF) Header is a Genuine OEM International/Navistar component designed for compatible 7-gallon DEF tank applications. The header incorporates QLS 1% SSI sensing technology and supports DEF tank monitoring within the vehicle's SCR aftertreatment system.

PRODUCT INFORMATION

• Part Number: 4353001C91
• Brand: International/Navistar
• Condition: New
• Component: DEF Header
• Sensor Type: QLS 1% SSI
• DEF Tank Capacity: 7 gallons
• Fuel Type: Diesel
• System: Diesel Exhaust Fluid / SCR Aftertreatment

APPLICATIONS

• Compatible International/Navistar diesel truck applications
• 7-gallon DEF tank systems
• DEF and SCR aftertreatment systems using compatible QLS 1% SSI components

Exact fitment depends on vehicle configuration, DEF tank design, sensor system, and original equipment specifications.

FUNCTION

The DEF header is installed in the DEF tank and supports monitoring of diesel exhaust fluid conditions through the integrated QLS 1% SSI sensing system. It provides sensor information used by the vehicle's DEF and SCR systems.

A worn, damaged, or failing DEF Header may cause symptoms such as:

• Incorrect DEF level readings
• DEF system warning messages
• DEF quality or sensor-related faults
• SCR or aftertreatment fault codes
• Check engine or emissions warning indicators
• Incorrect DEF system information

WHY REPLACE A DEF HEADER?

A properly functioning DEF header is important for accurate monitoring of the DEF tank and reliable SCR aftertreatment operation. Replacing a damaged or failed header can help restore correct DEF sensing and system communication.

FITMENT INFORMATION

Always verify the part number, VIN, vehicle model, DEF tank capacity, QLS/SSI 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: 4353001C91