When your E-ONE vehicle with a Cummins ISL engine begins to show DEF (Diesel Exhaust Fluid) warnings, reduced power modes, or dosing errors, the DEF head unit is often the source of the problem. This component is responsible for controlling the flow and delivery of DEF to the exhaust system, directly influencing emissions compliance and aftertreatment health. Using the correct OEM 1113741-002 head unit ensures your SCR system functions properly and keeps your vehicle within regulatory limits.
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Communicates with sensors (such as fluid level, temperature, and pressure) to ensure accurate dosing commands sent to the DEF injector.
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Coordinates with the ECU to time DEF injections correctly during regeneration or normal operation—ensuring the SCR catalyst has the right conditions to reduce NOx.
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Helps detect and prevent faults like over- or under-dosing, which can lead to emissions failures, warning lights, or power derates.
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Built to OEM construction and calibration, offering seamless integration with wiring, mounts, and control systems—making replacement easier and more dependable.
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Constructed to endure harsh conditions—temperature, vibration, and DEF chemistry—so a durable and proper part is essential to long-term reliability.
If your DEF system shows signs of error or operational instability, installing a genuine OEM 1113741-002 head unit is often the fix you need. It restores accurate control to the DEF circuit, helps avoid further damage, and ensures your vehicle’s emissions system remains compliant and robust for the long haul.
