Wacker Neuson Deutz DEF Head Unit
WACKER NEUSON DEUTZ DEF HEAD UNIT
ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY
WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a New, Tamerx DEF Head Unit, Tamerx part number 5100078973 ( OEM Part Number 5100078973 ).This part is primarily made for a Deutz , production years 2013-2024, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
OEM NUMBERS
| Primary OEM | 5100078973 |
| Additional OEM | 5100078973 |
ADDITIONAL DETAILS
| CONDITION | New |
| UPC / Barcode | 00840490542365 |
| WEIGHT | 5.00 LBS |
SHIPPING OPTIONS
Ship Weight : 5.00 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.
Engineered for precision, the Wacker Neuson Deutz DEF Head Unit 5100078973 is designed to maintain accurate Diesel Exhaust Fluid system function in Wacker Neuson equipment powered by Deutz engines from 2013 to 2024. This genuine OEM component is built to meet factory specifications, providing precise fitment, dependable performance, and seamless compatibility with emissions control systems. By regulating DEF flow and monitoring system integrity, it helps ensure emissions compliance and efficient engine operation in heavy-duty construction and industrial applications. Its rugged design is built to withstand tough worksite conditions, offering long-term durability and reliability. For operators and fleets, this DEF head unit delivers OEM-certified quality and consistent performance to keep equipment running at its best.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2013 | Deutz | |||||
| 2014 | Deutz | |||||
| 2015 | Deutz | |||||
| 2016 | Deutz | |||||
| 2017 | Deutz | |||||
| 2018 | Deutz | |||||
| 2019 | Deutz | |||||
| 2020 | Deutz | |||||
| 2021 | Deutz | |||||
| 2022 | Deutz | |||||
| 2023 | Deutz | |||||
| 2024 | Deutz | |||||
PEOPLE ALSO ASKS | BLOG(S)
The DEF head unit (sometimes called the sensor head or header) mounts to the DEF tank and serves multiple sensing, routing, and protection tasks. Inside, you’ll typically find:
- Header Housing / Body
- The outer shell that bolts to the DEF tank opening, forming the sealed interface and supporting internal parts.
- Level Sensor / Probe
- Measures how much Diesel Exhaust Fluid remains in the tank and provides a signal to the engine/aftertreatment system.
- Temperature Sensor / Thermistor
- Monitors the fluid’s temperature to detect freezing or overheating conditions.
- Pickup / Suction Port
- The inlet through which DEF is drawn from the tank toward the dosing/injection system.
- Return / Bypass Port or Flow Path
- A channel or port that returns unused or excess DEF back into the tank for circulation.
- Internal Filter / Strainer
- A mesh or screen to filter out particles, crystals, or contaminants before fluid leaves the tank.
- Electrical Connector & Sensor Wiring
- Connectors, pins, and wiring that transmit sensor data (level, temperature) to the engine control or DEF control module.
- Seals, Gaskets & O-Rings
- Elastomer seals ensuring leak-tight joints under vibration, thermal expansion, and chemical exposure.
- Fasteners / Mounting Hardware
- Bolts, screws, or clamps that secure the head unit to the tank and maintain structural stability.
These components work together so that the head unit can sense fluid status, protect downstream components, route DEF properly, and communicate critical data to the control systems.\
The DEF (Diesel Exhaust Fluid) Head Unit is a key part of your vehicle’s emissions system. It measures DEF level, temperature, and quality to help maintain compliance and system efficiency. When it starts to fail, many drivers wonder whether it can be serviced or repaired instead of replaced. Unfortunately, the answer is almost always no — and here’s why.
Why a DEF Head Unit Is Not Serviceable
The DEF head unit is a sealed electronic component. Inside are sensors and circuitry that operate in a corrosive DEF environment. Once these internal parts fail or become contaminated, they cannot be accessed or repaired. Attempting to open the unit usually causes more damage and makes it unusable.
Common Causes of DEF Head Unit Failure:
- Contaminated DEF fluid
- introducing dirt, debris, or crystallization
- Moisture intrusion
- damaging internal electronics
- Extreme temperatures
- causing sensor degradation
- Normal wear and aging
- after years of operation
The Only Reliable Solution: Replacement
If your DEF head unit has failed, replacement is the only effective fix. A new OEM-quality unit restores accurate readings and prevents derate mode or fault codes. While repairs aren’t possible, proactive maintenance can extend the lifespan of your new unit.
How to Prevent Premature Failure
- Always use fresh, certified DEF fluid.
- Keep containers sealed and free of contaminants.
- Avoid extreme heat or freezing during DEF storage.
- Inspect the DEF system regularly for buildup or leaks.
A DEF Head Unit is not serviceable or repairable. Because it’s a sealed component, replacement is the only dependable way to restore system performance and ensure emissions compliance. Preventive care is the best strategy to keep your next unit lasting for years.
An incompatible unit may fail to communicate with the ECM, causing system faults or inaccurate readings.
Yes, a faulty sensor in the head unit can lead to inaccurate or fluctuating DEF readings.
Yes, if DEF freezes inside the tank, it can crack internal components or damage connectors.
Contaminated DEF, corroded wiring, or poor grounding are the most common causes of failure.
Deutz DEF Head Units
