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Cummins ISF3.8, QSF3.8 SCR Filter 2011-2020: OEM 4376889

CUMMINS ISF3.8, QSF3.8 SCR FILTER 2011-2020: OEM 4376889

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$4,495.00

CORE CHARGE:

$550.00
iCORE DISCLAIMER: The CORE charge is a 30 day hold and will not be processed as long as the CORE is returned within 30 days. If you do not have a CORE or fail to return the CORE within 30 days, the CORE charge hold amount will be processed at that time.

AVAILABILITY IN STOCK
OEM NUMBER4376889
PART TYPESCR Filter
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEISF3.8, QSF3.8
YEAR2011-2020
PART NUMBER4376889RM-SCR
APPLICATION NOTESTier 4
ADDITIONAL NOTESOutlet Module

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx SCR Filter, Tamerx part number 4376889RM-SCR ( OEM Part Number 4376889 ). 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 ISF3.8, QSF3.8, production years 2011-2020, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

Additional Notes: Outlet Module

OEM NUMBERS

Primary OEM4376889
Additional OEM4376889

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490552739
WEIGHT44.00 LBS

SHIPPING OPTIONS

Ship Weight : 44.00 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.


Designed for 2011–2020 Cummins ISF 3.8 and QSF 3.8 diesel applications, the SCR Filter (OEM 4376889) is an essential component of the exhaust aftertreatment system. This selective catalytic reduction filter is engineered to match factory exhaust configurations and emissions sensor locations specific to these engine platforms. Its function is to work with diesel exhaust fluid (DEF) to reduce nitrogen oxide (NOₓ) emissions in the exhaust stream, supporting compliance with applicable emissions standards across these model years. Reliable SCR filter operation helps maintain consistent exhaust flow and supports the effectiveness of the overall aftertreatment system. This page provides application-specific details to assist with accurate identification of the Cummins ISF 3.8 / QSF 3.8 SCR Filter OEM 4376889 for service and replacement needs.

FITMENT CHART

YEARMAKEENGINE(S)
2011Cummins ISF3.8 QSF3.8
2012Cummins ISF3.8 QSF3.8
2013Cummins ISF3.8 QSF3.8
2014Cummins ISF3.8 QSF3.8
2015Cummins ISF3.8 QSF3.8
2016Cummins ISF3.8 QSF3.8
2017Cummins ISF3.8 QSF3.8
2018Cummins ISF3.8 QSF3.8
2019Cummins ISF3.8 QSF3.8
2020Cummins ISF3.8 QSF3.8

PEOPLE ALSO ASKS | BLOG(S)

The Cummins ISF3.8 and QSF3.8 SCR Filter, OEM 4376889, is a vital aftertreatment emissions component used in 2011–2020 diesel applications. Its main role is to reduce nitrogen oxide (NOx) emissions, helping equipment and vehicles meet strict emissions regulations while keeping the exhaust system operating correctly.

SCR stands for Selective Catalytic Reduction, a process designed to treat regulated exhaust gases after combustion. Unlike a DPF filter that captures soot, the SCR unit focuses on chemical conversion. The system injects Diesel Exhaust Fluid (DEF) into the exhaust stream upstream of the SCR filter. As DEF mixes with hot exhaust, it breaks down into ammonia, which reacts inside the SCR catalyst to convert harmful NOx into nitrogen and water vapor.

This conversion process is essential for modern Cummins emissions systems and helps prevent common aftertreatment issues caused by poor NOx control.

Key benefits of the Cummins SCR Filter (OEM 4376889) include:

  • Reduces NOx emissions through SCR conversion
  • Works with DEF dosing for regulated exhaust treatment
  • Supports emissions compliance for ISF3.8 and QSF3.8 engines
  • Helps prevent SCR fault codes and warning lights
  • Maintains stable aftertreatment operation in 2011–2020 applications

OEM 4376889 is a core SCR component that supports clean exhaust output and long-term diesel emissions reliability.

You can prolong the lifespan of an SCR filter (SCR catalyst) by protecting it from DEF contamination, preventing DEF crystallization, and keeping the DEF dosing system working correctly. Since the SCR depends on chemical reactions to reduce NOx, keeping the catalyst clean and properly supplied is the key to long service life.

Best ways to extend SCR filter lifespan

  • Use only high-quality DEF
    • Always use DEF that meets ISO standards and comes from sealed, reputable containers. Poor DEF can contain minerals that permanently poison the SCR catalyst.
  • Prevent DEF contamination
    • Never mix DEF with water, fuel, coolant, or additives. Even small contamination can damage the catalyst and trigger NOx efficiency faults.
  • Store DEF properly
    • Keep DEF sealed and stored in a cool, clean environment. Heat and dirt degrade DEF quality and increase deposit formation.
  • Avoid DEF crystallization
    • DEF crystals form when DEF dries inside the doser/injector or exhaust piping. Make sure the injector isn’t leaking/dripping and system heaters work correctly.
  • Fix DEF dosing issues early
    • A weak DEF pump, clogged injector, failing doser valve, or damaged heated lines can cause under- or over-dosing, accelerating SCR failure.
  • Maintain proper exhaust temperatures
    • Frequent short trips keep exhaust too cool for proper SCR function and increase deposits. Regular steady driving helps keep SCR in the correct operating range.
  • Keep upstream emissions components healthy
    • DOC or DPF issues can affect exhaust flow and temperature, placing extra strain on the SCR and shortening its lifespan.

An SCR filter lasts longest when DEF quality is protected, crystallization is prevented, dosing stays accurate, and upstream emissions components remain in good condition.

It provides a catalyst surface where diesel exhaust fluid (DEF) reacts with exhaust gases to reduce nitrogen oxides.

It is installed in the aftertreatment section of the exhaust system downstream of DEF injection.

Diesel Exhaust Fluid (DEF) is used with this SCR filter to support NOx conversion.

Yes, the SCR filter helps reduce nitrogen oxides in the engine’s exhaust to support emissions compliance.

Cummins SCR Filters

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