04-30774-004 | Genuine Freightliner® DEF Header Level and Quality Sensor

Description and Purpose: The Freightliner® Diesel Exhaust Fluid (DEF) Level Quality Sensor Header, Part Number 04-30774-00, is an OEM-quality truck part designed for Freightliner M2 106 models with Cummins engines (2002–2016). This DEF Tank Header module features 6-bolt mounting (module type: DEF Tank Header, mounting: 6-bolt, capacity: 6-gallon applications) and is crucial for accurately monitoring DEF level and quality within the SCR emission control system of heavy-duty commercial vehicles.

Why Replacement is Important: A faulty DEF header sensor can cause inaccurate DEF level/quality readings, dashboard warnings (DEF light, check engine), potential engine power reduction (derate), SCR system faults, and emission compliance issues. Replacing it with a direct replacement sensor meeting OEM specifications ensures accurate DEF system monitoring, prevents costly aftertreatment system repairs, and maintains vehicle compliance and uptime.

Impact on Vehicle Performance: Vital for the Selective Catalytic Reduction (SCR) system, this sensor ensures the aftertreatment system has accurate data on DEF level and quality. This enables effective NOx reduction by the SCR system, supports optimal engine performance, helps maintain fuel efficiency, and ensures the heavy-duty vehicle meets strict emission standards required for commercial truck operation.

Manufacturer Information: Freightliner® is a leading North American manufacturer known for its medium and heavy-duty trucks and integrated truck components. ¹ Recognized for producing durable, OEM-quality parts designed specifically for their vehicles, Freightliner components are trusted by fleet managers, service technicians, and commercial truck owners for reliability and performance in demanding operations. 

Tags Category: DEF Sensor, DEF Header, DEF Level Sensor, DEF Quality Sensor, DEF Sending Unit, DEF Tank Component, SCR System, Emission Control, Aftertreatment System, Freightliner M2 Part, Truck Parts, Heavy-Duty Part

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