LieBherr Cummins ISL DEF Sensor Head
LIEBHERR CUMMINS ISL DEF SENSOR HEAD
ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY
WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Remanufactured, Tamerx DEF Sensor Head, Tamerx part number 4310-22-7 ( OEM Part Number 1033997 ). 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 | 1033997 |
| Additional OEM | 1033997 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490540842 |
| WEIGHT | 3.00 LBS |
SHIPPING OPTIONS
Ship Weight : 3.00 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.
Accurate DEF system performance depends on the Liebherr Cummins ISL DEF Sensor Head: OEM 1033997, a direct-fit replacement for compatible Liebherr machinery. Built to OEM standards, this sensor head monitors diesel exhaust fluid level, temperature, and quality to ensure emissions compliance and reliable aftertreatment operation. Its durable construction withstands tough working conditions, helping protect the exhaust system and maintain overall engine efficiency. By selecting an OEM DEF sensor head, you reduce the risk of compatibility issues and promote long-term reliability. This component is a proven solution for keeping Liebherr Cummins-powered equipment running smoothly and without interruption.
PEOPLE ALSO ASKS | BLOG(S)
The DEF Sensor Head (OEM 1033997) is a critical part of the emissions system on Liebherr machines with Cummins ISL engines. It’s mounted on the DEF tank, and it combines multiple sensors and fluid flow components into a single module. The purpose is to monitor and regulate the Diesel Exhaust Fluid (DEF) used in the Selective Catalytic Reduction (SCR) system for reducing nitrogen oxides (NOₓ) emissions.
Key Roles and Operations
- Fluid Level Sensing
- One of its primary jobs is detecting how much DEF fluid is in the tank. It sends this information to the engine control system so it knows when fluid levels are low and alerts are needed.
- Fluid Temperature Monitoring
- Because DEF can freeze or become less effective at cold temperatures, this module checks the fluid’s temperature. If the fluid gets too cold, other systems (like heating or control logic) can respond accordingly.
- Fluid Filtration
- Inside the sensor head is a built‑in filter (often around 40 microns) that removes debris or contaminant particles before the DEF fluid is drawn up into downstream components. This helps protect sensitive injectors and the rest of the SCR system.
- Fluid Routing (Suction and Return)
- The sensor head includes the necessary ports/tubes for drawing DEF out of the tank (suction) into the dosing system and for returned, unused or excess fluid to go back to the tank. This helps maintain proper flow and prevents air or fluid flow issues.
- Sensor Feedback for Engine Control
- The head unit’s sensors send data (level, temperature, sometimes fluid quality) back to the engine’s ECU (Engine Control Unit). If any parameter is outside of expected ranges, the ECU may trigger warnings, alter engine behavior, or initiate derate to protect emissions compliance.
A properly functioning sensor head like OEM 1033997 helps ensure your machine remains emissions compliant, avoids warning lights and power reductions, and keeps the SCR/DEF system running smoothly. If this component fails or gives incorrect readings, it can lead to reduced engine performance, engine derate, or increased emissions—and potentially regulatory issues.
The DEF (Diesel Exhaust Fluid) sensor head—also called the DEF head unit or tank sensor—monitors critical data such as fluid level, temperature, and quality. When it fails, it can trigger false warnings, reduced engine output, or compliance issues. Understanding the causes of failure can help you prevent costly repairs and downtime.
Common Causes of DEF Sensor Head Failure
Several environmental and mechanical factors can lead to premature sensor failure:
- Contaminated DEF fluid
- Using expired or low-quality DEF introduces impurities that can damage internal sensors.
- Crystallization
- DEF naturally forms crystals when exposed to air or evaporation, which can clog sensor ports and connectors.
- Freeze damage
- DEF freezes at 12°F (-11°C). If the heating elements within the head unit fail or freeze cycles are frequent, internal components can crack or malfunction.
- Electrical issues
- Corroded wiring, loose connectors, or short circuits can disrupt communication between the sensor and engine control unit.
- Tank overfilling or spillage
- Overflow can leak into electrical areas and cause damage to sensitive electronics.
Use high-quality DEF, store it properly, and regularly inspect connections. Early attention to minor faults can prevent full sensor head failure.
It measures DEF tank level, quality, and temperature in Cummins ISL engines.
It provides accurate DEF readings to prevent unnecessary derates and downtime.
Yes, a defective unit can cause power loss and limit equipment productivity.
It ensures accurate DEF data is sent to the emissions system for compliance.
Cummins DEF Sensor Heads
