When your truck is built on a Spartan chassis and powered by a Cummins ISX engine, few components are as critical—but as underappreciated—as the DEF (Diesel Exhaust Fluid) head unit. This small yet essential module carries a weighty responsibility: it ensures your aftertreatment system can reliably monitor and dose DEF. If it fails or drifts out of spec, you face fault codes, check engine lights, or engine derates that can derail your uptime.
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Monitors DEF fluid parameters — level, temperature, and urea concentration — and feeds accurate data to your engine control module
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Controls precise dosing of DEF into the exhaust stream, allowing the SCR (Selective Catalytic Reduction) system to reduce NOx emissions effectively
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Built to OEM 10071997 standards, so it fits seamlessly in Spartan Cummins ISX systems
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Helps prevent emissions warnings, engine derates, and fault codes caused by miscommunication or bad sensor signals
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Designed to endure vibration, thermal cycling, and the corrosive nature of DEF chemicals
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Simplifies replacement with a drop-in design that minimizes downtime
Don’t let a faulty DEF head module compromise your emissions compliance or put your truck in limp mode. Installing the OEM 10071997 Spartan Cummins ISX DEF Head Unit restores system integrity, keeps your SCR system operating smoothly, and protects you from surprise errors or downtime. Treat this module not just as a sensor—but as a guardian of your emissions system’s health.






















































































































































































































































































