
Cummins ISB 6.7L, B6.7 SCR Filter 2018-2022: OEM 4394860
CUMMINS ISB 6.7L, B6.7 SCR FILTER 2018-2022: OEM 4394860

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Remanufactured Tamerx SCR Filter, Tamerx part number 202-0215RM-SCR ( OEM Part Number 4394860 ). 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 ISB 6.7L, B6.7, production years 2018-2022, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
OEM NUMBERS
| Primary OEM | 4394860 |
| Additional OEM | 4394860 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490548138 |
| WEIGHT | 80.00 LBS |
SHIPPING OPTIONS
Ship Weight : 80.00 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.
Covering 2018–2022 Cummins ISB 6.7L applications, the B6.7 SCR Filter (OEM 4394860) is a key component of the Selective Catalytic Reduction system used to manage emissions. This SCR filter is engineered specifically for the Cummins ISB 6.7L engine, ensuring proper fitment with factory exhaust assemblies and emissions sensors. Its role is to work with DEF (diesel exhaust fluid) to help reduce nitrogen oxides in the exhaust stream, supporting compliance with emissions regulations for these model years. Proper SCR filter operation helps maintain consistent exhaust flow and supports the effectiveness of the overall aftertreatment system. This page provides application-specific details for the Cummins ISB 6.7L SCR Filter (OEM 4394860) used in 2018, 2019, 2020, 2021, and 2022 vehicles, assisting with accurate identification for service and replacement needs.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2018 | Cummins | ISB 6.7L | B6.7 | |||
| 2019 | Cummins | ISB 6.7L | B6.7 | |||
| 2020 | Cummins | ISB 6.7L | B6.7 | |||
| 2021 | Cummins | ISB 6.7L | B6.7 | |||
| 2022 | Cummins | ISB 6.7L | B6.7 | |||
PEOPLE ALSO ASKS | BLOG(S)
The main cause of SCR (Selective Catalytic Reduction) filter failure is contamination and chemical poisoning of the catalyst, which prevents it from converting harmful exhaust gases effectively. Unlike a DPF, an SCR does not trap soot—it relies on precise chemical reactions, and once those reactions are disrupted, the system can no longer function correctly.
The most common causes of SCR filter failure include:
- DEF contamination or poor-quality DEF
- Using contaminated, diluted, or incorrect DEF introduces impurities that poison the catalyst coating. Even small amounts of fuel, oil, or minerals in DEF can permanently damage the SCR.
- Incorrect DEF dosing
- Over-dosing or under-dosing DEF prevents proper NOx conversion. Over time, this leads to crystal buildup, ammonia slip, and catalyst degradation.
- Exhaust fluid crystallization
- Incomplete DEF atomization or low exhaust temperatures can cause DEF to crystallize inside the SCR, restricting flow and damaging the catalyst surface.
- Oil or coolant contamination
- Internal engine leaks allow non-combustible substances to enter the exhaust. These contaminants coat the SCR catalyst and destroy its chemical activity.
- Excessive exhaust temperatures
- Prolonged high heat can thermally damage the SCR catalyst, reducing efficiency and triggering emissions faults.
- Upstream emissions system failures
- Failed DOC or DPF components can overload the SCR with unconverted pollutants, accelerating deterioration.
SCR filter failure is primarily caused by contamination, improper DEF management, and thermal damage. Once the catalyst is poisoned or damaged, replacement is the only reliable solution.
The SCR filter reduces nitrogen oxide emissions by treating exhaust gases with DEF.
Yes, OEM 4394860 is engineered for Cummins ISB 6.7L and B6.7 applications from 2018–2022.
The SCR filter is positioned downstream of the diesel particulate filter.
Yes, it operates as part of the DEF-based selective catalytic reduction system.










































