TEMSA Cummins ISB 6.7L DEF Head Unit
TEMSA CUMMINS ISB 6.7L 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 4310-18-17 ( OEM Part Number RP169194 ). This part is primarily made for a Cummins ISB 6.7L, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
Additional Notes: DEF Header, 40 MICRON, 18"
OEM NUMBERS
| Primary OEM | RP169194 |
| Additional OEM | RP169194, TMS00194-H |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490540552 |
| 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.
Engineered for accuracy and reliability, the TEMSA Cummins ISB 6.7L DEF Head Unit, OEM part number RP169194, ensures precise monitoring and control of Diesel Exhaust Fluid (DEF) levels, temperature, and quality within the emissions system. Manufactured to OEM specifications, this head unit provides an exact fit and dependable performance under demanding diesel operating conditions. Built from high-quality, corrosion-resistant materials, it withstands exposure to DEF and extreme environmental factors for long-lasting durability. Each unit is thoroughly tested for sensor accuracy, electrical integrity, and consistent operation. Ideal for professional diesel technicians and fleet maintenance teams, this OEM DEF head unit supports efficient emissions control and reliable performance for Cummins ISB 6.7L engines used in TEMSA vehicles.
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The DEF (Diesel Exhaust Fluid) Head Unit designated OEM RP169194 is mounted on the DEF tank of TEMSA vehicles powered by the Cummins ISB 6.7 L engine. It is the critical interface between the tank’s DEF fluid and the vehicle’s emissions/aftertreatment system.
What It Does
- Monitors DEF Level
- The head unit senses the amount of DEF remaining in the tank and sends that information to the Engine Control Module (ECM) or DEF-system controller so the system knows when fluid is low.
- Tracks DEF Temperature
- It includes temperature sensing capability to detect when the fluid is too cold (risk of freezing) or too warm (risk of degradation) so the system can respond accordingly.
- Routes the Fluid
- As the “header” unit, it provides a pickup port for fluid leaving the tank toward the dosing/injection system and may also provide a return path for unused fluid—thus ensuring flow and circulation.
- Filters & Protects
- It incorporates an internal filter or strainer that blocks particles, crystals or contaminants from leaving the tank and damaging downstream components.
- Sends Signals
- Sensor data (level, temperature, condition) is fed to the ECM/aftertreatment controller so dosing, regeneration, alerts and diagnostics can be managed accurately.
Since the SCR system relies on proper DEF delivery and condition, the head unit OEM RP169194 serves as the “brain and plumbing” of the DEF tank. Without accurate level or temperature data, or without clean fluid flow via the header, the engine could face dosing errors, emissions faults, reduced performance or costly downtime.
The DEF (Diesel Exhaust Fluid) Head Unit is one of the most important components in your truck’s emissions system. It measures DEF level, quality, and temperature, helping the vehicle maintain compliance with emissions standards. When it fails, your truck can enter derate mode, limiting power and causing costly downtime. Understanding what causes DEF Head Unit failure can help prevent it before it happens.
Common Causes of DEF Head Unit Failure
- DEF Contamination
- The leading cause of DEF Head Unit failure is contaminated fluid. When dirt, dust, or fuel gets into the DEF tank, it can damage the sensors inside the head unit. Even small particles of debris or residue can cause corrosion or disrupt sensor readings.
- Crystallization
- When DEF is exposed to air or temperature extremes, it can form crystals. These crystals can coat the sensors or block the pickup tube, leading to incorrect readings and eventual sensor failure.
- Extreme Temperatures
- The DEF system operates within a specific temperature range. Freezing conditions can cause DEF to expand, cracking internal components, while high heat accelerates sensor degradation and fluid breakdown.
- Moisture or Corrosion
- If moisture enters the system through a damaged seal or vent, it can corrode the electrical connections or internal sensors. Over time, corrosion interferes with communication between the DEF Head Unit and the engine control module (ECM).
- Poor Handling and Storage
- Improper storage or handling of DEF — such as using unclean containers, funnels, or transfer pumps — introduces impurities. These impurities accumulate in the tank, shortening the life of the DEF Head Unit.
- Normal Wear and Aging
- Even with perfect care, DEF Head Units wear out over time. On average, they last 5 to 7 years, depending on operating conditions and maintenance. Constant exposure to DEF fluid and vibration eventually wears down the sensors and electronics.
How to Prevent DEF Head Unit Failure
- Always use certified, uncontaminated DEF fluid (meeting ISO 22241 standards).
- Store DEF in clean, sealed containers away from sunlight or freezing conditions.
- Avoid cross-contamination by using dedicated DEF equipment only.
- Inspect the DEF tank regularly for crystallization or buildup.
- Address DEF-related fault codes as soon as they appear.
A DEF Head Unit can fail due to contamination, crystallization, temperature extremes, or simply age. With clean handling practices, proper DEF storage, and regular system maintenance, you can significantly extend the life of your DEF Head Unit and avoid unnecessary downtime.
It monitors and regulates the diesel exhaust fluid (DEF) system — including fluid level, temperature and quality — to ensure the vehicle’s emissions system functions correctly.
Yes — contaminated, degraded or improper DEF fluid can damage sensors in the head unit and lead to incorrect readings or failure.
Not necessarily fully drained, but the tech should relieve any pressure, check fluid cleanliness and inspect for debris prior to installation for best results.
It should be checked at major DEF system services or when DEF-related warnings appear — typically at each major maintenance interval.
Cummins DEF Head Units
