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Doosan D34 DEF Head Unit

DOOSAN D34 DEF HEAD UNIT

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$895.00

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 NUMBER 46699859
PART TYPE DEF Head Unit
BRAND Tamerx Diesel Products
ENGINE MAKE Doosan
ENGINE TYPE D34
YEAR
PART NUMBER 4310-11-2
APPLICATION NOTES Doosan
ADDITIONAL NOTES DEF Header, 40 MICRON, 11"

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 4310-11-2 ( OEM Part Number 46699859 ). This part is primarily made for a Doosan D34, 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 OEM46699859
Additional OEM7381451, 46699859

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490539907
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.


Upgrade your Doosan D34 with the Doosan D34 DEF Head Unit — a precision-engineered solution that monitors DEF level, temperature, and quality in real time. Built tough for rugged jobsite conditions, this unit integrates seamlessly with your SCR system, helping prevent costly derates and keeping your machine clean, compliant, and ready to work.

PEOPLE ALSO ASKS | BLOG(S)

For construction and service machinery using the Doosan D34 platform, keeping the emissions aftertreatment system in top shape is essential for compliance and reliability. One of the critical, yet often overlooked, components is the DEF (Diesel Exhaust Fluid) head unit. The OEM 7381451 version monitors fluid properties, enables proper dosing, and maintains communication with the engine control module. A failing DEF head can lead to error codes, derates, or emissions faults exactly when you least want them.

  • Tracks DEF fluid level, temperature, and urea concentration, delivering accurate data to the ECU

  • Regulates precise dosing of DEF into the exhaust stream so that your SCR (Selective Catalytic Reduction) system can reduce NOx emissions correctly

  • Built to OEM 7381451 specifications for plug-and-play compatibility and maintained calibration

  • Helps prevent fault codes, emissions warnings, and engine derates that stem from misread or drifting sensor data

  • Includes a 40-micron filter to protect downstream components from contamination

  • Designed to handle field-level stresses: vibration, thermal cycling, and exposure to corrosive DEF fluid

When emissions errors start cropping up, many operators chase downstream components—injectors, sensors, wiring—before ever checking the DEF head. But the OEM 7381451 Doosan D34 DEF Head Unit is often the first culprit in the chain reaction. By installing the correct, quality replacement, you restore system integrity, reduce surprises, and keep your machine running clean and dependable. Don’t let a small sensor become your system’s downfall.

The DEF (Diesel Exhaust Fluid) head unit is a vital component in your vehicle’s emissions system. It tracks DEF level, temperature, and quality, sending this information to the engine control module (ECM). When the head unit fails, the ECM may not receive accurate data—and that can directly affect engine performance.

How a Faulty DEF Head Unit Can Lead to Reduced Power

  • False DEF Level Warnings
    If the unit incorrectly reports that the DEF tank is low or empty, the ECM may reduce power to maintain emissions compliance.

  • Poor DEF Quality Alerts
    A malfunctioning quality sensor can send false signals, leading the system to limit torque or speed unnecessarily.

  • Temperature Reading Errors
    Inaccurate temperature data may confuse the ECM, triggering protective measures that reduce power.

  • Diagnostic Trouble Codes (DTCs)
    Persistent fault codes such as P203F, P205B, or P207F can force the engine into derate mode.

  • Regulatory Compliance Safeguards
    Emissions regulations require engines to limit output if DEF data is missing or invalid, ensuring the vehicle cannot operate out of compliance.

Yes—a faulty DEF head unit can cause reduced engine power. What may begin as a simple warning light can escalate to derate mode, severely limiting vehicle performance. Addressing DEF head issues promptly ensures your engine remains reliable, compliant, and avoids costly downtime.

A built-in temperature sensor monitors the fluid’s temperature and relays that information to the control system.

Typical problems include sensor failure, clogged filter, freezing in cold conditions, or erratic readings.

You may see DEF-system error codes, inconsistent level or temperature readings, or engine derate.

It should be checked during regular maintenance or anytime DEF/emissions warnings appear.

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