When your Oshkosh vehicle powered by a Cummins engine is required to meet modern emissions standards, the smallest components often make the biggest difference. The OEM 3353523 DEF head unit plays a pivotal role in the vehicle’s SCR (Selective Catalytic Reduction) system by precisely managing DEF (Diesel Exhaust Fluid) delivery and monitoring. When this unit fails, the result can be warning lights, error codes, even engine derates — all avoidable by using the correct head unit.
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Monitors DEF fluid level, temperature, and urea concentration to ensure the system has accurate data to work with
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Regulates the dosing of DEF into the exhaust stream at the correct timing and quantity for optimal NOx reduction
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Maintains fit and calibration by meeting OEM 3353523 specifications, ensuring proper compatibility with your Oshkosh / Cummins system
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Prevents issues such as misleading sensor readings, malfunction warnings, or unnecessary engine derate due to poor DEF system feedback
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Built to withstand the harsh environment of an emissions system: thermal cycling, vibration, fluid exposure and corrosion risk
In the world of emissions-control systems, it’s easy to overlook the head unit for the DEF tank. But pragmatically, it’s one of the most critical nodes—without it the SCR system cannot function reliably. By installing the correct OEM 3353523 unit, you safeguard your DEF system's accuracy, maintain compliance, and help your vehicle stay road-ready when you need it most.


























































