E-ONE Cummins ISL DEF Head Unit
E-ONE CUMMINS ISL DEF HEAD UNIT
ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY
WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 4310-22-4 ( OEM Part Number 716074 ). This part is primarily made for a Cummins ISL, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
Additional Notes: DEF Header, 40 MICRON, 22"
OEM NUMBERS
| Primary OEM | 716074 |
| Additional OEM | 716074 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490540798 |
| WEIGHT | 8.00 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.
Maintain accurate diesel exhaust fluid monitoring with the E-ONE Cummins ISL DEF Head Unit (OEM 716074). This genuine OEM component is designed to measure DEF level, temperature, and quality, ensuring optimal performance of your vehicle’s emissions system. Built to Cummins and E-ONE specifications, it provides precise communication with the engine’s aftertreatment system for consistent and reliable operation. The rugged construction withstands harsh conditions, offering long-term durability and dependable service. Trust Tamerx Diesel Products LLC for authentic DEF system replacement parts that help keep your Cummins ISL-powered equipment running efficiently and in compliance with emissions standards.
PEOPLE ALSO ASKS | BLOG(S)
The E-ONE Cummins ISL DEF Head Unit (OEM 716074) is a vital part of the Diesel Exhaust Fluid (DEF) system designed for E-ONE vehicles powered by Cummins ISL engines. This component plays an essential role in maintaining proper DEF flow and monitoring key system data that keeps your engine running clean and compliant with emissions regulations.
The DEF Head Unit manages the transfer of DEF fluid from the tank to the exhaust system, where it’s used in the Selective Catalytic Reduction (SCR) process to reduce harmful nitrogen oxide (NOx) emissions. It also tracks vital information such as DEF level, temperature, and quality, helping the engine’s control module make accurate adjustments for optimal operation.
Key Features
- Ensures precise DEF delivery to the SCR system
- Monitors DEF fluid level, temperature, and concentration
- Provides accurate data to the engine control module
- Designed to handle heavy-duty conditions found in E-ONE emergency vehicles
- OEM-certified for reliable fit and performance
Without a properly functioning DEF Head Unit, the system can’t accurately measure or deliver the correct amount of DEF, which can trigger warning lights, fault codes, or even cause engine derate. The OEM 716074 unit ensures dependable emissions control, long-term system health, and smooth operation for your E-ONE Cummins ISL engine.
The Diesel Exhaust Fluid (DEF) head unit is a key part of your vehicle’s emissions system, responsible for monitoring DEF level, temperature, and quality. Like other electronic sensors, it has a limited service life, and its reliability depends on maintenance, operating conditions, and DEF quality.
On average, a DEF head unit lasts between 100,000 and 150,000 miles, though this can vary. Vehicles that operate in harsh conditions — such as extreme heat, cold, or dusty environments — may experience earlier failures. DEF contamination or crystallization in the tank can also shorten the lifespan by clogging or damaging internal components.
Factors that affect DEF head unit lifespan include:
- Contaminated or expired DEF fluid
- Frequent short trips that allow DEF to crystallize
- Corroded wiring or connectors
- Extended exposure to extreme temperatures
To help your DEF head unit last longer, always use fresh, certified DEF, store it properly, and inspect the tank area for buildup or leaks during regular maintenance.
When the unit begins to fail, you may see DEF level errors, warning lights, or even engine derate mode. Replacing a failing DEF head unit promptly helps maintain emissions compliance and prevents costly downtime.
Clear diagnostic codes, monitor DEF system readings (level, temperature, pressure) via scan tool, and confirm that no new fault codes appear and dosing functions properly.
Use certified DEF fluid, keep the tank and fill system clean, inspect connectors and wiring regularly, and avoid crystallization buildup in the DEF system.
Yes — since E-ONE vehicles often work under demanding duty cycles, a faulty DEF head unit can result in emissions faults or engine power limitations, which could affect availability.
Typically no special calibration is required if the correct unit is installed and the wiring is connected properly; however, clearing codes and verifying operation is recommended.
Cummins DEF Head Units
