International DEF Sensors in Aftertreatment Systems

DEF sensors are a key component of the Selective Catalytic Reduction (SCR) system. They provide real-time data to the ECM, allowing precise control of DEF dosing and emissions reduction.

International DEF sensors typically monitor:

• DEF fluid level in the tank
• DEF temperature
• DEF quality (urea concentration)
• System pressure (in certain configurations)

This data ensures proper SCR system operation and helps maintain emissions compliance under all operating conditions.

How DEF Sensors Impact Engine Operation

International engines rely on accurate DEF sensor data to manage emissions systems. If incorrect readings are detected, the ECM may limit engine performance to prevent emissions violations.

• Controls DEF dosing rate into the exhaust stream
• Prevents operation with contaminated or incorrect DEF
• Triggers warning lights and fault codes
• Supports proper NOx reduction efficiency

Sensor issues can quickly lead to derate conditions, making proper operation essential for maintaining uptime.

Common International Engine Applications

International DEF sensors are used across diesel engines equipped with SCR systems in commercial truck platforms.

• International MaxxForce DT engines
• International MaxxForce 10 and 13 engines
• International A26 diesel engines
• International LT and ProStar trucks

Different emissions systems and configurations may require specific sensor types, so part number verification is important before replacement.

Common DEF Sensor Failure Symptoms

• DEF level or quality fault codes
• Check engine or SCR warning lights
• Engine derate conditions
• Incorrect DEF level readings
• SCR efficiency or NOx-related faults

Failures may be caused by DEF crystallization, contamination, electrical faults, or internal sensor degradation.

Installation & System Considerations

When replacing a DEF sensor, inspecting the full DEF system helps prevent repeat failures.

• Check DEF tank for contamination or debris
• Inspect DEF lines and injector for buildup
• Verify wiring harness and connectors
• Use DEF fluid meeting ISO 22241 standards

Proper maintenance helps ensure long-term reliability and consistent SCR performance.

Verify Fitment Before You Buy

DEF sensors vary depending on engine model and emissions configuration. To confirm compatibility before ordering, provide:

• Engine serial number
• Truck year / make / model
• Current DEF sensor part number
• Sensor type (level, quality, temperature)
• Photos of the sensor and connector if available

This ensures the correct International DEF sensor is selected for your application.

Why Buy International DEF Sensors from Advanced Truck Parts?

• Fitment verification before purchase
• Reliable aftertreatment components
• Fast shipping to minimize downtime
• Support for fleets and repair technicians
• Competitive pricing on emissions system parts