When your truck carries a Navistar or International drivetrain paired with a Cummins engine, one component quietly holds the emissions system together: the DEF (Diesel Exhaust Fluid) head unit. The Navistar / International Cummins DEF Head Unit, OEM 2515900C1 (Tamerx part 5410-11-FA01-4), is central to the feedback loop that ensures your SCR (Selective Catalytic Reduction) system operates accurately. If this head unit malfunctions or drifts out of spec, your system may throw warning codes, enforce engine derates, or even fail emissions checks.
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Monitors DEF fluid level, temperature, and urea concentration, feeding real-time data to the ECU
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Regulates precise dosing of DEF into the exhaust stream to support effective NOx conversion
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Matched to OEM 2515900C1 standards for plug-and-play integration with Navistar / International systems
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Helps prevent fault codes, emissions warnings, and engine derates that stem from poor sensor readings
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Built with internal filtration (40 microns) to trap contaminants before they reach downstream components
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Engineered to survive vibration, thermal cycling, and exposure to DEF’s corrosive nature
Don’t wait for a system error to surface before you check your DEF head. Installing the correct OEM 2515900C1 unit restores accuracy to your emissions feedback loop, ensures your SCR system performs as intended, and helps your truck stay compliant and dependable. In emissions control, small sensors can make big differences—and this one deserves your attention.