2515991C1 | Genuine OEM International/Navistar 15 Gallon DEF QLS Sensor Head Unit

The 2515991C1 DEF Tank QLS 1% SSI Sensor Head Unit is a Genuine OEM International/Navistar component designed for compatible 15-gallon Diesel Exhaust Fluid (DEF) tank systems. It monitors DEF tank conditions and provides sensor information to the vehicle's emissions and SCR system.

PRODUCT INFORMATION

• Part Number: 2515991C1
• Brand: International/Navistar
• Condition: New
• Component: DEF Tank QLS Sensor Head Unit
• Sensor Type: QLS 1% SSI Sensor
• DEF Tank Capacity: 15 Gallons
• System: Diesel Exhaust Fluid / SCR
• Application: Heavy-duty commercial trucks

APPLICATIONS

Designed for selected International/Navistar truck applications using a compatible 15-gallon DEF tank and QLS sensor configuration. Exact fitment varies by vehicle model, engine, DEF tank configuration, and original equipment specifications.

FUNCTION

The DEF tank sensor head unit monitors DEF level and related tank conditions and communicates this information to the vehicle control system. Proper sensor operation supports accurate DEF monitoring and SCR emissions system operation.

A worn, damaged, or failing DEF TANK SENSOR HEAD UNIT may cause symptoms such as:

• Incorrect DEF level readings
• DEF warning messages
• DEF system fault codes
• Incorrect sensor readings
• SCR or emissions system warnings
• Reduced vehicle performance due to DEF system faults

WHY REPLACE A DEF TANK SENSOR HEAD UNIT?

A faulty sensor head can provide incorrect DEF tank information and cause DEF or SCR system faults. Replacing it with a Genuine OEM International/Navistar component helps restore accurate DEF monitoring and proper system operation.

FITMENT INFORMATION

Please verify the part number, VIN, vehicle model, engine, DEF tank capacity, and original sensor specifications before ordering. Exact fitment varies by vehicle and DEF system configuration.

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: 2515991C1