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Generic  |  SKU: 1554678

1554678 | Genuine Generic® DEF Sensor Head 18"

$1,28900
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ConditionNew
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A DEF (Diesel Exhaust Fluid) Sensor Head Assembly 1554678 is a critical emissions control component in modern diesel engines equipped with Selective Catalytic Reduction (SCR) systems. It monitors and manages various aspects of the DEF tank and fluid, ensuring that the vehicle meets emissions regulations by properly injecting DEF into the exhaust stream. DEF Sensor Head 18", Digital, Deutsch DT4 (STD)

General Specifications

Condition New
Part Number 1554678
Brand Generic

Specifications

Electrical Connector Deutsch DT4 (STD)
Sensor Type Digital (canbus)
DEF Header Height (IN) 18

Fitment

 Blue Bird, Capacity,Dynapac, E-One, Equipment Technologies, Kalmar Ottawa, Liugong Construction, Manitou, McNeilus, Newell Coach, Pierce, Rev Parts, Rosenbauer, Sany, Terex, TICO Tractors, Tiffin Motorhomes, Doosan Bobcat, Gillig, Battle Motors, Crane Carrier Company, Cummins, Grande West / Vicinity Motors

Purpose & Function

Function Purpose
Level Sensor Detects how much DEF is in the tank
Quality Sensor Measures DEF concentration (should be 32.5% urea / 67.5% deionized water)
Temperature Sensor Monitors DEF temperature to prevent freezing or overheating
Heater Warms DEF in cold weather so it can flow to the injector
Filter Prevents debris from entering the DEF injection system
Electronic Interface Communicates with the Engine Control Module (ECM) via CAN bus

Signs of a Bad DEF Sensor Head

  • DEF level or quality fault codes

  • "Incorrect DEF Quality" warning

  • DEF tank shows full/empty incorrectly

  • Engine derates or restricts speed

  • Emissions system warnings

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