DEF Sensor
Genuine OEM DEF Sensor Head Assemblies
An inaccurate DEF level reading or a failed sensor head assembly can trigger a derate, throw an emissions fault code, or leave the SCR system flying blind on fluid quality. Because the sensor head sits at the heart of DEF monitoring — measuring level, temperature, and fluid quality together — a generic replacement rarely communicates correctly with the vehicle's ECM. That's why every DEF sensor in this collection is genuine OEM, matched to the manufacturer's original part number.
What's in this category
This collection covers genuine OEM DEF sensor components, including:
- DEF sensor head assemblies — tank-mounted units that monitor DEF level, temperature, and fluid quality
- DEF sensor head control manifolds — integrated manifold assemblies that combine sensing and fluid control functions
- Exhaust fluid header DEF sensor kits — complete sensor kits for DEF header assemblies
Brands we cover
This collection includes genuine OEM DEF sensor parts for Kalmar Ottawa, Gillig, Cummins, and RevFireGroup — and more, with new listings added regularly.
Why order your DEF sensor here
- Genuine OEM only — every part is matched to the manufacturer's original part number, not a generic equivalent
- Built for accurate fitment — listings include the exact OEM number so you can verify the right part before you buy
- Fast turnaround — ships quickly to keep your emissions system in compliance
FAQ
What does a DEF sensor head assembly do? It monitors diesel exhaust fluid level, temperature, and quality inside the DEF tank, sending data to the ECM to confirm the SCR system has sufficient, compliant fluid for emissions control.
Signs of a failing DEF sensor? Inaccurate DEF level readings, DEF quality fault codes, an unexpected derate, or a warning light that won't clear even after refilling with fresh fluid.
Genuine OEM or aftermarket? All parts here are genuine OEM — no generic substitutes.
How do I find the right DEF sensor? Match the OEM number on your old sensor, or check your service manual for the correct reference, then search that number above.
Browse the full selection below, or search by OEM part number to find your exact match.
Original price
$1,099.00
-
Original price
$1,099.00
Original price
$1,099.00
$1,099.00
-
$1,099.00
Current price
$1,099.00
1554670 Genuine Spartan Grizzly DEF Sensor Head
SpartanProduct Overview The 1554670 is a genuine Spartan DEF sensor head designed for compatible diesel exhaust fluid system applications. It monitors DEF...
View full details
Original price
$1,099.00
-
Original price
$1,099.00
Original price
$1,099.00
$1,099.00
-
$1,099.00
Current price
$1,099.00
Original price
$389.00
-
Original price
$389.00
Original price
$389.00
$389.00
-
$389.00
Current price
$389.00
4163695C91 Genuine International DEF Sensor 16/23G QLS SSI
InternationalProduct Overview The 4163695C91 is a genuine International DEF sensor developed for 16/23G QLS SSI diesel exhaust fluid system applications. It mea...
View full details
Original price
$389.00
-
Original price
$389.00
Original price
$389.00
$389.00
-
$389.00
Current price
$389.00
Original price
$389.00
-
Original price
$389.00
Original price
$389.00
$389.00
-
$389.00
Current price
$389.00
2515985C3 Genuine International DEF Sensor 16/23G QLS SSI
InternationalProduct Overview The 2515985C3 is a genuine International DEF sensor engineered for 16/23G QLS SSI diesel exhaust fluid system applications. It det...
View full details
Original price
$389.00
-
Original price
$389.00
Original price
$389.00
$389.00
-
$389.00
Current price
$389.00
Original price
$389.00
-
Original price
$389.00
Original price
$389.00
$389.00
-
$389.00
Current price
$389.00
4254216C91 Genuine International DEF Sensor 16/23G QLS SSI
InternationalProduct Overview The 4254216C91 is a genuine International DEF sensor designed for 16/23G QLS SSI diesel exhaust fluid system applications. It moni...
View full details
Original price
$389.00
-
Original price
$389.00
Original price
$389.00
$389.00
-
$389.00
Current price
$389.00
Original price
$389.00
-
Original price
$389.00
Original price
$389.00
$389.00
-
$389.00
Current price
$389.00
2515986C1 Genuine International DEF Sensor 16/23G QLS SSI
InternationalProduct Overview The 2515986C1 is a genuine International DEF sensor designed for 16/23G QLS SSI diesel exhaust fluid system applications. It monit...
View full details
Original price
$389.00
-
Original price
$389.00
Original price
$389.00
$389.00
-
$389.00
Current price
$389.00
Original price
$389.00
-
Original price
$389.00
Original price
$389.00
$389.00
-
$389.00
Current price
$389.00
4097727C91 Genuine International DEF Sensor 16/23G QLS SSI
InternationalProduct Overview The 4097727C91 is a genuine International DEF sensor designed for 16/23G QLS SSI diesel exhaust fluid system applications. It moni...
View full details
Original price
$389.00
-
Original price
$389.00
Original price
$389.00
$389.00
-
$389.00
Current price
$389.00
Original price
$389.00
-
Original price
$389.00
Original price
$389.00
$389.00
-
$389.00
Current price
$389.00
5012174R91 Genuine International DEF Sensor 16/23G QLS SSI
InternationalProduct Overview The 5012174R91 is a genuine International DEF sensor designed for 16/23G QLS SSI diesel exhaust fluid system applications. It moni...
View full details
Original price
$389.00
-
Original price
$389.00
Original price
$389.00
$389.00
-
$389.00
Current price
$389.00
Original price
$1,099.00
-
Original price
$1,099.00
Original price
$1,099.00
$1,099.00
-
$1,099.00
Current price
$1,099.00
90035877 Genuine Kalmar Ottawa DEF Sensor Head Assembly
Kalmar OttawaProduct Overview The 90035877 is a genuine Kalmar Ottawa DEF Sensor Head Assembly designed for factory diesel exhaust fluid system operation. This ...
View full details
Original price
$1,099.00
-
Original price
$1,099.00
Original price
$1,099.00
$1,099.00
-
$1,099.00
Current price
$1,099.00
Original price
$1,289.00
-
Original price
$1,289.00
Original price
$1,289.00
$1,289.00
-
$1,289.00
Current price
$1,289.00
DM701-1800F765 Genuine Spartan Diesel DEF Sensor Head
SpartanProduct Overview The DM701-1800F765 is a genuine Spartan DEF Diesel Exhaust Fluid Sensor Head designed for factory DEF system operation. This senso...
View full details
Original price
$1,289.00
-
Original price
$1,289.00
Original price
$1,289.00
$1,289.00
-
$1,289.00
Current price
$1,289.00
Original price
$1,029.00
-
Original price
$1,029.00
Original price
$1,029.00
$1,029.00
-
$1,029.00
Current price
$1,029.00
90035845PS Genuine Kalmar Ottawa DEF Sensor Head Assembly 11.6 Inch
Kalmar OttawaProduct Overview The 90035845PS is a genuine Kalmar Ottawa DEF sensor head assembly engineered for diesel exhaust fluid system applications. This m...
View full details
Original price
$1,029.00
-
Original price
$1,029.00
Original price
$1,029.00
$1,029.00
-
$1,029.00
Current price
$1,029.00
Original price
$1,099.00
-
Original price
$1,099.00
Original price
$1,099.00
$1,099.00
-
$1,099.00
Current price
$1,099.00
1009212002 Genuine RevFireGroup DEF Sensor Head Control Manifold
RevFireGroupProduct Overview The 1009212002 is a genuine RevFireGroup control manifold designed for diesel exhaust fluid system applications. This multifunctio...
View full details
Original price
$1,099.00
-
Original price
$1,099.00
Original price
$1,099.00
$1,099.00
-
$1,099.00
Current price
$1,099.00
Original price
$1,099.00
-
Original price
$1,099.00
Original price
$1,099.00
$1,099.00
-
$1,099.00
Current price
$1,099.00
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...
View full details
Original price
$1,099.00
-
Original price
$1,099.00
Original price
$1,099.00
$1,099.00
-
$1,099.00
Current price
$1,099.00
Original price
$1,029.00
-
Original price
$1,029.00
Original price
$1,029.00
$1,029.00
-
$1,029.00
Current price
$1,029.00
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...
View full details
Original price
$1,029.00
-
Original price
$1,029.00
Original price
$1,029.00
$1,029.00
-
$1,029.00
Current price
$1,029.00
Original price
$749.00
-
Original price
$749.00
Original price
$749.00
$749.00
-
$749.00
Current price
$749.00
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...
View full details
Original price
$749.00
-
Original price
$749.00
Original price
$749.00
$749.00
-
$749.00
Current price
$749.00