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Cummins B6.7 SCR 2018-2024: OEM 4394891

CUMMINS B6.7 SCR 2018-2024: OEM 4394891

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$4,995.00

AVAILABILITY IN STOCK
OEM NUMBER4394891
PART TYPESCR
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEB6.7
YEAR2018-2024
PART NUMBER102-0296RM-SCR
APPLICATION NOTESDTNA 200-260 EPA21

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx SCR, Tamerx part number 102-0296RM-SCR ( OEM Part Number 4394891 ). All parts are proudly remanufactured in the U.S.A. to the highest of OEM standards, and improvements are often applied to the original design in the remanufacturing process. This part is primarily made for a Cummins B6.7, production years 2018-2024, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM4394891
Additional OEM4394891

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490551725
WEIGHT75.00 LBS

SHIPPING OPTIONS

Ship Weight : 75.00 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.


Hit the road with confidence using the Cummins B6.7 SCR 2018–2024: OEM 4394891, designed to keep your emissions system performing at its best. This genuine OEM Selective Catalytic Reduction unit helps cut harmful pollutants and boosts fuel efficiency for dependable daily operation. Built for rugged durability and seamless integration, it’s the go-to choice for heavy-duty applications. Trust in quality that supports cleaner performance mile after mile.

FITMENT CHART

YEARMAKEENGINE(S)
2018Cummins B6.7
2019Cummins B6.7
2020Cummins B6.7
2021Cummins B6.7
2022Cummins B6.7
2023Cummins B6.7
2024Cummins B6.7

PEOPLE ALSO ASKS | BLOG(S)

Modern diesel trucks rely on advanced aftertreatment systems to stay compliant, efficient, and dependable on the road. One of the most important parts of that system is the Selective Catalytic Reduction (SCR) assembly, which plays a central role in reducing harmful emissions. For Cummins B6.7 engines built from 2018 through 2024, the Cummins B6.7 SCR 2018–2024: OEM 4394891 delivers a direct-fit, reliable solution for maintaining proper exhaust emissions control and keeping your engine operating cleanly and effectively.

    • The SCR (Selective Catalytic Reduction) assembly is designed to lower nitrogen oxide (NOx) emissions, transforming them into nitrogen
      and water to help your truck meet EPA emissions standards and environmental requirements.

    • The OEM 4394891 SCR component is engineered specifically for Cummins B6.7 engines from 2018 to 2024,
      ensuring accurate fitment and dependable compatibility with factory aftertreatment systems.

    • Working in conjunction with your DEF dosing system, this SCR assembly supports effective exhaust treatment,
      helping optimize DEF usage and maintain balanced emissions processing throughout operation.

    • Choosing the correct OEM SCR unit helps prevent emissions warning lights, fault codes, and derate conditions that can cause
      unexpected downtime or costly repairs.

    • A properly functioning SCR system supports long-term reliability by minimizing emissions buildup and protecting other
      aftertreatment components from unnecessary wear and stress.

    • Installing an OEM-quality replacement like the Cummins B6.7 SCR 2018–2024: OEM 4394891 gives you confidence in durability,
      correct system integration, and dependable performance under demanding conditions.

When maintaining your Cummins B6.7 emissions system, selecting the right SCR component is essential for clean operation and regulatory compliance. The OEM 4394891 SCR assembly is a trusted solution that helps restore effective emissions control and keeps your truck performing at its best. At Tamerx Diesel Parts, we offer quality components to help you reduce downtime and stay focused on the road ahead.

 

A Selective Catalytic Reduction (SCR) system is built to last for many miles while reducing nitrogen oxide emissions in diesel exhaust. However, certain operating conditions, poor maintenance habits, and contamination issues can cause the SCR to fail much earlier than expected. Understanding these causes helps prevent costly repairs and emissions downtime.

  • Poor-quality or contaminated DEF: Incorrect diesel exhaust fluid can damage the catalyst and reduce system efficiency.

  • DEF crystallization buildup: Low exhaust temperatures or improper dosing can lead to hardened DEF deposits that restrict flow.

  • Upstream DPF or DOC problems: Excess soot and ash entering the SCR can contaminate the catalyst prematurely.

  • Faulty NOx sensors or dosing components: Incorrect readings or DEF delivery issues disrupt proper exhaust treatment.

  • Frequent short trips and extended idling: Low-temperature operation prevents DEF from breaking down correctly.

  • Ignoring warning lights or fault codes: Delayed repairs allow minor issues to escalate into major SCR failures.

Premature SCR failure is often caused by contamination, improper DEF management, or unresolved upstream exhaust issues. Proactive maintenance and early diagnostics are the best ways to protect the SCR system and ensure long-term emissions reliability.

By effectively lowering NOx output, this SCR filter helps the engine comply with environmental regulations and emissions laws. Proper SCR performance is essential for passing emissions inspections.

Frequent SCR or DEF warning lights, persistent fault codes, and reduced engine performance are common signs of SCR issues. These symptoms often mean the filter is no longer reducing NOx efficiently.

A blocked SCR filter can cause increased exhaust backpressure, engine performance issues, and possible derate conditions. Replacing the filter helps restore normal emissions flow and performance.

Yes — a failing SCR unit often triggers DEF, SCR, or check engine lights on the dashboard. These indicators help alert you that the emissions system isn’t operating correctly.

Cummins SCRs