In modern diesel engines, emission compliance hinges on accurate monitoring—and the DEF (Diesel Exhaust Fluid) head unit is one of the most critical sensors in that chain. The Perkins DEF Head Unit (OEM T434814) handles functions that many operators take for granted: sensing fluid level, temperature, and quality, then regulating dosing based on that data. When it fails or deviates from spec, error codes, derates, and extended downtime can follow.
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Tracks DEF fluid level, temperature, and urea concentration, sending real-time readings to the ECU
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Regulates the injection or dosing of DEF into the exhaust to support the SCR (Selective Catalytic Reduction) system in reducing NOx
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Designed to meet OEM T434814 tolerances, ensuring your emissions system stays correctly calibrated
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Helps prevent emission faults, warning lights, and engine derates caused by sensor drift or failure
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Built to survive challenging conditions—vibration, temperature fluctuations, and exposure to DEF’s chemistry
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Field-friendly for replacement, helping you restore functionality without lengthy downtime
Because the DEF head unit acts as a gatekeeper for your emissions system, it often reveals problems before anything else does. Replacing a faulty or aging unit with the OEM T434814 Perkins DEF Head restores sensor integrity, prevents unpredictable faults, and helps maintain compliance. In the world of aftertreatment, this is one component you don’t want to neglect.