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Bobcat D34 DEF Head Unit

BOBCAT 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 7381451
PART TYPE DEF Head Unit
BRAND Tamerx Diesel Products
ENGINE MAKE Bobcat
ENGINE TYPE D34
YEAR
PART NUMBER 4310-11-1
APPLICATION NOTES Bobcat
ADDITIONAL NOTES DEF Header, 40 MICRON, 11"

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 4310-11-1 ( OEM Part Number 7381451 ). This part is primarily made for a Bobcat 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 OEM7381451
Additional OEM7381451, 46699859

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490539891
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.


Elevate the emissions control on your Bobcat D34 with the precision-built Bobcat D34 DEF Head Unit — engineered to monitor DEF fluid level, temperature, and quality in real time. Rugged and reliable, this unit integrates seamlessly into your SCR system to help prevent derates, maintain compliance, and keep your machine performing clean and confident under all conditions.

PEOPLE ALSO ASKS | BLOG(S)

If your Bobcat D34 is equipped with SCR aftertreatment, the DEF (Diesel Exhaust Fluid) head unit is one of those unsung heroes. The Bobcat D34 DEF Head Unit, OEM 7381451 (Tamerx part 4310-11-1) monitors fluid parameters, regulates dosing, and ensures your emissions system stays in check. When it malfunctions or drifts out of calibration, you could see warning codes, reduced performance, or even system shutdowns.

  • Monitors DEF fluid level, temperature, and urea concentration, delivering accurate feedback to the engine’s ECU

  • Controls precise dosing of DEF into the exhaust stream so the SCR (Selective Catalytic Reduction) system can reduce NOx emissions properly

  • Equipped with a 40-micron filter to protect injectors from contamination

  • Built to match OEM 7381451 tolerances for compatibility and calibration integrity

  • Helps avoid error codes, emissions warnings, and engine derates rooted in incorrect or drifting sensor signals

  • Constructed to endure harsh operating conditions—vibration, heat cycle stress, and exposure to DEF chemistry

Because it’s often overlooked, the DEF head unit is a common point of failure in emissions systems. Replacing it with the correct unit—OEM 7381451 Tamerx 4310-11-1—restores your system’s sensor fidelity, safeguards your SCR’s function, and helps keep your Bobcat D34 running clean, compliant, and dependable. Don’t let a small sensor become your emissions bottleneck.

The DEF (Diesel Exhaust Fluid) head unit is responsible for measuring DEF level, temperature, and quality. It communicates this data to the engine control module (ECM) so the emissions system can operate properly. When the head unit malfunctions, the ECM may receive inaccurate information, often resulting in warning lights or diagnostic trouble codes (DTCs).

How a Bad DEF Head Triggers Warnings and Codes

  • Dashboard Warning Lights
    A faulty head unit may cause the check engine light or DEF system alerts to appear.

  • False DEF Level or Quality Alerts
    The system may show the tank as empty or report poor-quality DEF even when the fluid is full and certified.

  • Recurring Diagnostic Trouble Codes (DTCs)
    Fault codes such as P203F (DEF level issue), P205B (temperature sensor fault), or P207F (quality sensor problem) are often linked to head unit failures.

  • Inconsistent Sensor Readings
    The ECM may log errors if the data it receives is erratic or unrealistic compared to actual DEF conditions.

  • Escalation to Derate
    If unresolved, these warnings and codes can eventually lead the vehicle into reduced power (derate) mode.

Yes—a bad DEF head can absolutely trigger warning lights and fault codes. While some alerts may seem like minor annoyances, they should never be ignored. Addressing DEF head unit issues promptly helps prevent escalation to derate mode, reduces downtime, and ensures your vehicle remains emissions-compliant.

Excess DEF may lead to ammonia slip, waste fluid, or trigger downstream emissions faults.

Depressurize the DEF system, disconnect wiring, unbolt the unit, and reseal properly when reinstalling.

With good maintenance and clean DEF, it can last several years, matching the life of the emissions system.

If heater or antifreeze functions fail, the DEF may freeze or become too thick to flow correctly.

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