Whether it’s a loader, excavator, or other work machine, the DEF (Diesel Exhaust Fluid) system is essential for staying emissions-compliant. The Doosan Bobcat Cummins DEF Head Unit, built to OEM 46854881 specifications, acts as the “brain” for your DEF tank—monitoring fluid properties, controlling dosing, and supplying live data to the engine control module. When it starts to fail, warning codes, SCR faults, or engine derates can follow fast.
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Measures DEF fluid level, temperature, and urea concentration to ensure the engine receives accurate inputs
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Regulates the precise dosing of DEF into the exhaust stream so your SCR (Selective Catalytic Reduction) system can reduce NOx emissions properly
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Drops in as a direct replacement for OEM 46854881, preserving calibration and compatibility
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Helps avoid fault codes, emission system warnings, or derates triggered by sensor drift or failure
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Built to endure the harsh environments your equipment faces—vibration, temperature swings, and DEF’s corrosive chemistry
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Field-ready replacement design reduces downtime when you need to swap it out
In field operations, a failing DEF head unit often shows up as a sudden warning from the emissions or engine systems. But by then, it’s already impacted your machine’s reliability. Upgrading or replacing with the OEM 46854881 Doosan Bobcat Cummins DEF Head Unit restores sensor integrity, stabilizes your emissions circuit, and helps keep your equipment running clean and uninterrupted. Don’t ignore this component—treat it as essential maintenance rather than an afterthought.