5012171R91 | Genuine OEM International/Navistar DEF Sensor for 7-Gallon Tank, QLS 1% SSI

The 5012171R91 DEF sensor is specified for compatible 7-gallon Diesel Exhaust Fluid (DEF) tank applications and features QLS 1% SSI technology. It is a component of the vehicle's DEF monitoring and emissions aftertreatment system. Verify the original part number and tank configuration before ordering.

PRODUCT INFORMATION

Part Number: 5012171R91
Brand: International / Navistar
Condition: Genuine OEM — confirm the item's actual condition with the seller
Component: DEF Tank Sensor
Tank Capacity: 7 Gallons
Sensor Specification: QLS 1% SSI
System: Diesel Exhaust Fluid (DEF) / SCR Aftertreatment System

APPLICATIONS

Designed for compatible International/Navistar vehicles using a 7-gallon DEF tank with the specified QLS 1% SSI sensor. Exact vehicle compatibility should be verified using the original part number and tank configuration.

FUNCTION

The DEF tank sensor provides monitoring information to the vehicle's DEF system. Proper sensor operation supports DEF monitoring and helps the vehicle's aftertreatment system identify potential sensor or fluid-related issues.

SIGNS OF A FAULTY DEF TANK SENSOR

• Incorrect DEF level readings

• DEF quality or level warnings on the dashboard

• DEF or aftertreatment system warning lights

• Diagnostic trouble codes related to the DEF sensor

• Inconsistent sensor readings

• Emissions system warnings or related performance restrictions

WHY REPLACE THE DEF TANK SENSOR?

A defective sensor can provide inaccurate information to the DEF monitoring system and trigger warning messages or diagnostic codes. Replacing a confirmed faulty sensor with the correct compatible part can help restore reliable system monitoring.

FITMENT INFORMATION

Confirm that part number 5012171R91 matches your original sensor and 7-gallon DEF tank configuration. Sensor specifications and connections can vary between applications, so verify the QLS 1% SSI specification before purchase.

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: 5012171R91