DEF
Genuine OEM DEF Parts: Sensors, Multifunction Head Units & Doser Injectors
A flashing derate warning or a DEF fault code can shut your truck down in minutes — and every hour it sits is an hour it’s not earning. Most DEF system failures trace back to one of a handful of components: a worn level sensor, a cracked multifunction head unit, or a failing doser injector. Replacing it with the wrong part, or a cheap aftermarket substitute, often just brings the same fault code back a few weeks later. That’s why every DEF part in this catalog is genuine OEM, sourced directly against the manufacturer’s original part number.
What's in this category
This collection covers the core components of the Diesel Exhaust Fluid (SCR) system across heavy trucks, buses, and off-road equipment:
- DEF multifunction head units — the combined level, temperature, and quality sensor assembly mounted in the DEF tank
- Diesel exhaust fluid sensor heads — standalone level and quality sensors
- DEF header assemblies — tank header/cap assemblies that house the sensor and pickup tube
- DEF doser injectors — the metering injector that delivers fluid into the exhaust stream (Cummins B6.7, L9, X12, X15 and more)
- DEF wiring & tank jumper harnesses — the connecting harnesses between the sensor and the vehicle's ECM
Brands we stock
We carry genuine DEF parts for the OEMs running across North American fleets, including Freightliner, Spartan, Caterpillar, Cummins, International/Navistar, Volvo, Mack, Ford, Hyundai, Doosan, Bobcat, Terex, E-One, Gillig, TEMSA, Stewart & Stevenson, Hollingshead Mixer, Capacity, JLG, Ferrara Fire Apparatus, and Kalmar Ottawa. If you don’t see your exact OEM number listed, search by part number above or contact us — new listings are added regularly.
Why order DEF parts here
- Genuine OEM only — every part is matched to the manufacturer's original part number, not a generic equivalent
- Built for cross-reference — listings include the exact OEM number so you can verify fitment against your service manual or VIN before you buy
- Fleet-ready inventory — broad coverage across trucks, buses, fire apparatus, and off-road equipment, not just one brand
- Fast turnaround — ships quickly to keep your truck off the lift and back on the road
FAQ
What does a DEF multifunction head unit do? It's the sensor assembly mounted in the DEF tank that reports fluid level, temperature, and quality to the ECM. When it fails, the system often can't verify DEF quality and triggers a derate to protect emissions compliance.
How do I know if my DEF sensor is failing? An inaccurate level gauge, a DEF quality fault code, an unexpected derate, or a warning light that won't clear even after refilling with quality fluid.
Genuine OEM or aftermarket? All parts here are genuine OEM — no generic substitutes.
How do I find the right part? Match the OEM number on your old component, or check your service manual/VIN, then search that number above.
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0430798001 Genuine Freightliner DEF Tank Header For 13/23G System
Line Truck PartsProduct Overview The 0430798001 is a genuine Freightliner DEF tank header engineered for 13/23G diesel exhaust fluid system applications. Installed...
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0431353006 Genuine Freightliner DEF Tank Header For SAE Flange
FreightlinerProduct Overview The 0431353006 is a genuine Freightliner DEF tank header engineered for diesel exhaust fluid storage and aftertreatment system app...
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4197240C93 Genuine International DEF 7 Gallon Tank Conversion Assembly
InternationalProduct Overview The 4197240C93 is a genuine International DEF 7-gallon tank conversion assembly designed for diesel exhaust fluid system applicati...
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OW90035845PS Genuine Kalmar Ottawa DEF Sensor Head Assembly 11.6 Inch
Kalmar OttawaProduct Overview The OW90035845PS is a genuine Kalmar Ottawa DEF sensor head assembly designed for specified DEF system applications. This multipur...
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0431353003 Genuine Freightliner SS DEF Header
FreightlinerProduct Overview The 0431353003 is a genuine Freightliner SS DEF header used in diesel exhaust fluid systems. This component manages DEF fluid rout...
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5011806 Genuine Blue Bird DEF Header
Blue BirdProduct Overview The 5011806 is a genuine Blue Bird DEF header designed for diesel exhaust fluid storage and delivery systems. This assembly monito...
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82-60670-000 Genuine Gillig Cummins DEF Multifunction Head Unit
Gillig CumminsProduct Overview The 82-60670-000 is a genuine Gillig Cummins DEF multifunction head unit designed for diesel exhaust fluid storage and delivery s...
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DC4Z-5J250-D Genuine Ford Module Multifunction DEF Head Unit
FordProduct Overview The DC4Z-5J250-D is a genuine Ford Module Multifunction DEF Head Unit designed for diesel exhaust fluid system applications. This ...
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2272104PEX Genuine Paccar DEF Doser Injector SCR Module
PaccarProduct Overview The 2272104PEX is a genuine Paccar DEF Doser Injector SCR designed for diesel exhaust fluid dosing system applications. This DEF d...
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04-31677-001 Genuine Freightliner DEF Header 13/23G
FreightlinerProduct Overview The 04-31677-001 is a genuine Freightliner DEF Header 13/23G designed for diesel exhaust fluid system applications. This DEF heade...
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04-30798-001 Genuine Freightliner DEF Tank Header For 13/23G System
Line Truck PartsProduct Overview The 04-30798-001 is a genuine Freightliner DEF tank header designed for 13/23G diesel exhaust fluid system applications. This comp...
View full details
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2512834C1 Genuine International DEF Tank Level Sensor For 5-Gallon DEF Tank
InternationalProduct Overview The 2512834C1 is a genuine International DEF tank level sensor designed for 5-gallon diesel exhaust fluid tank applications. This ...
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04-31354-001 Genuine Freightliner DEF Level Header 17.8 Inch
FreightlinerProduct Overview The 04-31354-001 is a genuine Freightliner DEF level header designed for diesel exhaust fluid system applications. This component ...
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2610044C1 Genuine International DEF Tank Level Sensor For 5-Gallon DEF Tank
InternationalProduct Overview The 2610044C1 is a genuine International DEF tank level sensor designed for 5-gallon diesel exhaust fluid tank applications. This ...
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2520612C1 Genuine International DEF Tank Level Sensor For 9-Gallon DEF Tank
InternationalProduct Overview The 2520612C1 is a genuine International DEF tank level sensor designed for 9-gallon diesel exhaust fluid tank applications. This ...
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2512835C1 Genuine International DEF Tank Level Sensor For 9-Gallon DEF Tank
InternationalProduct Overview The 2512835C1 is a genuine International DEF tank level sensor designed for 9-gallon diesel exhaust fluid tank applications. This ...
View full details
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1112302-002 Genuine RevFireGroup DEF Sensor Head Control Manifold
RevFireGroupProduct Overview The 1112302-002 is a genuine RevFireGroup DEF sensor head designed for diesel exhaust fluid system applications. This multifunctio...
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6212461 Genuine TICO DEF Control Manifold
TICOProduct Overview The 6212461 is a genuine TICO diesel exhaust fluid control manifold engineered for SCR emissions system and DEF tank applications....
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8289733000 Genuine Gillig DEF Control Manifold
GilligProduct Overview The 8289733000 is a genuine Gillig diesel exhaust fluid control manifold engineered for DEF storage and SCR aftertreatment system ...
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DC4Z5H297D Genuine Ford DEF Tank Level Sensor 5-Gal
FordProduct Overview The DC4Z5H297D is a genuine Ford DEF Tank Level Sensor 5-Gal designed for diesel exhaust fluid (DEF) system applications. This DEF...
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10056545 Genuine Blue Bird DEF Header
Blue BirdProduct Overview The 10056545 is a genuine Blue Bird DEF header used in diesel exhaust fluid systems on Blue Bird vehicles. This assembly monitors ...
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2520608C1 Genuine International DEF Header 40 Micron 18
InternationalProduct Overview The 2520608C1 is a genuine International DEF header used in diesel exhaust fluid tank and emissions system service. This assembly ...
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8600553-2S1 Genuine Rosenbauer Cummins DEF Multifunction Head Unit
Rosenbauer CumminsProduct Overview The 8600553-2S1 is a genuine Rosenbauer Cummins DEF multifunction head unit used in diesel exhaust fluid tank and emissions cont...
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5511560 Genuine Cummins Exhaust Fluid Header DEF Sensor Kit
CumminsProduct Overview The 5511560 is a genuine Cummins Exhaust Fluid Header DEF Sensor Kit designed for diesel exhaust fluid system applications. Thi...
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