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Oshkosh Cummins DEF Head Unit

OSHKOSH CUMMINS DEF HEAD UNIT

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$1,295.00

CORE CHARGE:

$250.00
iCORE DISCLAIMER: The CORE charge is a 30 day hold and will not be processed as long as the CORE is returned within 30 days. If you do not have a CORE or fail to return the CORE within 30 days, the CORE charge hold amount will be processed at that time.

AVAILABILITY IN STOCK
OEM NUMBER3353523
PART TYPEDEF Head Unit
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPE
YEAR
PART NUMBER5410-11-FA01-2
APPLICATION NOTESOshkosh
ADDITIONAL NOTESDEF Header, 40 MICRON, 11"

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 5410-11-FA01-2 ( OEM Part Number 3353523 ). This part is primarily made for a Cummins , and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

Additional Notes: DEF Header, 40 MICRON, 11"

OEM NUMBERS

Primary OEM3353523
Additional OEM3353523

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490540200
WEIGHT8.00 LBS

SHIPPING OPTIONS

Ship Weight : 8.00 LBS
UPS Ground, 2nd Day Air, Next Day Air

SHIPPING POLICY

Tamerx Diesel Products ships via UPS Ground. Next day air shipping can be arranged for a reasonable price of anywhere from $50.00 - $100.00 depending on the weight of the product and your location. We will do everything we can to make sure that you get the service you need. We understand how important it is to receive your order as quickly as possible.
In most cases Tamerx Diesel Products only needs one address, as long as your product is shipping to the same location as your billing information. In order to eliminate credit card fraud, your billing information must match the credit card you provide.

The terms, conditions, and details of our warranty vary from product to product. Specific warranty details can be found below.

Tamerx Diesel Products provides a replacement warranty on all of our parts. The duration and mileage limitations of the warranty vary by product and are specified on the product's detail page/item listing.

Please note that the warranty covers replacement of the part and the cost of shipping the replacement part to you only. It does not cover any shop, labor, towing, or any similar or related costs. This is not a "money back guarantee".

If you experience a problem with your part or it is not functioning properly, the correct warranty procedure is to call us at (510) 257-1777 (8:00 AM - 5:00 PM ET Monday through Friday). Be sure to have your order number and/or other relevant order information ready so we can easily locate your order and resolve your issue as quickly as possible. From that point, we will review with you any troubleshooting steps that may need to be taken and other areas or systems that can be checked to rule out external problems contributing to your part's issue. If a replacement is determined to be necessary, we will then arrange for your replacement part to ship out ASAP and issue any necessary return shipping labels and/or documents.

As is the case for the majority of the diesel products sold on Tamerx Diesel Products, your part's warranty is active as soon as you install it. In some other cases, warranty activation is contingent upon you sending us your core (i.e., your old part). Tamerx Diesel Products will provide you a return shipping label for parts that have a warranty with a core return condition. When we have received your core return, the part's warranty coverage begins. We reserve the right to void the product warranty if your core is not received within the allotted time, or if it isn't received at all. If the warranty for the diesel part you are purchasing has a core return requirement, it will be clearly noted on the product detail page/item listing.

What is a Core Charge?

A core charge (also called "core deposit") is similar to the deposit you might pay for a can or bottle of soda and is a standard requirement in the auto parts industry. For example, in many states, to promote recycling, you pay a deposit when you purchase a can of soda and receive your deposit back when you return the empty can. Many automotive parts have a core charge, or core price, that works in essentially the same way as a soda can deposit.

30 Day Core Charge Hold

You authorize Tamerx Diesel Products, to hold your credit card for the specified core charge amount and that you agree to return your core with 30 days of receiving the purchased part. When we have received your core return, the hold is released and the core charge payment is canceled.

The customer, or parts buyer, is responsible for any shipping costs associated with core returns unless otherwise specified in the product listing/detail page. Tamerx Diesel Products offers prepaid UPS shipping labels (SKU numbers UPS-CR1 and UPS-CR2) for use in returning your core that are available for purchase on our website during your shopping/order process.

The shipping label you will need to use for the core return is dependent upon what part you are purchasing. UPS-CR1 is good for cores weighing up to 20 pounds. UPS-CR2 is appropriate for shipping cores weighing 21 pounds or more. You must include enough information with the core return that clearly identifies it as a.) a Core Return, and b.) contains enough information we can use to clearly associate the core return with your order. Including a copy of the invoice or packing slip that came with the original shipment, clearly marked "Core Return", is ideal. Alternately, you can include a note marked as "Core Return" that includes your order number, full name and address, and phone number or other contact information. Failure to include this information with your returned core will most likely delay any due core credit being issued and/or delay any applicable warranty activation. Core returns need to be for the exact part purchased and cannot be damaged. Substituting another part in place of the part you have purchased is not acceptable.

All fluids must be drained.

If you have purchased a set or a parts package, you will need to return cores for all components of the set. For example, if you have purchaed a high pressure oil pump with an IPR valve, you will need to return both HPOP and IPR valve cores to receive proper credit. If you have purchased an EGR cooler/EGR valve package, your core return must consist of an EGR cooler core and an EGR valve core, or core credit will not be given.

Core Charges are often mandated by state legislature, and, as such, the actual core charge and taxes on the charge may vary depending on the state in which you buy your part. The Tamerx Diesel Products core charge presented to you online today with your item is representative of the most common core charge.


Equip your Oshkosh truck with the rugged OEM 3353523 DEF Head Unit, expertly crafted for seamless integration with Cummins engines. This precision-engineered module keeps your emissions system in check by monitoring DEF fluid flow, temperature, and level—ensuring smooth operation, fewer derates, and unmatched reliability for the long haul.

PEOPLE ALSO ASKS | BLOG(S)

When your Oshkosh vehicle powered by a Cummins engine is required to meet modern emissions standards, the smallest components often make the biggest difference. The OEM 3353523 DEF head unit plays a pivotal role in the vehicle’s SCR (Selective Catalytic Reduction) system by precisely managing DEF (Diesel Exhaust Fluid) delivery and monitoring. When this unit fails, the result can be warning lights, error codes, even engine derates — all avoidable by using the correct head unit.

  • Monitors DEF fluid level, temperature, and urea concentration to ensure the system has accurate data to work with

  • Regulates the dosing of DEF into the exhaust stream at the correct timing and quantity for optimal NOx reduction

  • Maintains fit and calibration by meeting OEM 3353523 specifications, ensuring proper compatibility with your Oshkosh / Cummins system

  • Prevents issues such as misleading sensor readings, malfunction warnings, or unnecessary engine derate due to poor DEF system feedback

  • Built to withstand the harsh environment of an emissions system: thermal cycling, vibration, fluid exposure and corrosion risk

In the world of emissions-control systems, it’s easy to overlook the head unit for the DEF tank. But pragmatically, it’s one of the most critical nodes—without it the SCR system cannot function reliably. By installing the correct OEM 3353523 unit, you safeguard your DEF system's accuracy, maintain compliance, and help your vehicle stay road-ready when you need it most.

The DEF (Diesel Exhaust Fluid) head unit is a key component in modern diesel engines, responsible for monitoring DEF level, temperature, and quality to keep emissions systems working properly. While built to last, the DEF head unit operates in harsh environments, which can shorten its service life over time. Understanding its typical lifespan and the factors that affect it helps ensure reliable performance and fewer unexpected failures.

Average Lifespan and Key Influencing Factors

  • Typical Lifespan
    A DEF head unit generally lasts between 100,000 and 150,000 miles, depending on usage and maintenance practices.

  • Quality of DEF Fluid
    Using clean, ISO-certified DEF fluid significantly extends lifespan, while contaminated or poor-quality fluid accelerates sensor wear.

  • Operating Environment
    Extreme cold or heat can reduce the longevity of internal components by stressing the sensors and electronics.

  • Maintenance Practices
    Regular inspections, proper tank cleaning, and checking for crystallization buildup help preserve the unit’s accuracy and reliability.

  • Driving Conditions
    Vehicles frequently used for heavy-duty or stop-and-go driving tend to experience faster wear due to higher operating temperatures.

  • Electrical Integrity
    Corrosion or damaged wiring can shorten the lifespan by interrupting communication between the head unit and the ECM (Engine Control Module).

A DEF head unit can last for many miles when maintained properly and used with clean DEF fluid. However, neglect, contamination, and extreme conditions can shorten its service life. Regular inspections and preventive care are the best ways to maximize longevity, ensuring your vehicle stays compliant and dependable on the road.

 

Symptoms may include “Service DEF” warning lights, engine derate, elevated exhaust temperature, or irregular DEF system readings.

Incorrect DEF dosing can lead to higher NOx emissions, catalyst damage, engine performance loss, or emission-system derate.

Regularly inspect wiring, connectors and the head unit for leaks or crystallization, and ensure DEF quality and tank seals are maintained.

Ignoring faults can result in costly after-treatment repairs, regulatory non-compliance, reduced engine performance, or unexpected downtime.

Cummins DEF Head Units

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