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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

$6,800.00

CORE CHARGE:

$500.00
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
BRANDCummins
ENGINE MAKECummins
ENGINE TYPEISF3.8, QSF3.8
YEAR2011-2020
PART NUMBER4376889-SCR
APPLICATION NOTESTier 4
ADDITIONAL NOTESOutlet Module

PRODUCT DESCRIPTION

This is a Genuine New Cummins SCR Filter, Cummins part number 4376889-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

CONDITIONGenuine New
UPC / Barcode00840490552746
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.


Covering 2011–2020 Cummins ISF 3.8 and QSF 3.8 applications, the SCR Filter with OEM 4376889 is an essential component of the diesel exhaust aftertreatment system. This selective catalytic reduction filter is engineered to match the exhaust configurations and emissions sensor locations specific to ISF 3.8 and QSF 3.8 engines, ensuring proper integration with factory DEF (diesel exhaust fluid) delivery and control systems. Its role is to work with DEF to reduce nitrogen oxide (NOₓ) emissions in the exhaust stream, supporting compliance with applicable emissions standards for these model years. Reliable SCR filter operation helps maintain consistent exhaust flow and contributes to the effective performance of downstream aftertreatment components. This page provides application-focused details to assist with identifying the Cummins ISF 3.8 / QSF 3.8 SCR Filter 2011–2020 (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 key part of the diesel aftertreatment system used in 2011–2020 applications. Its job is to reduce nitrogen oxide (NOx) emissions by using a chemical process called Selective Catalytic Reduction (SCR).

Unlike a DPF filter that traps soot, the SCR filter works by converting harmful exhaust gases into safer byproducts.

  • Step 1: Exhaust flows through the aftertreatment system
    • As the engine runs, exhaust gases travel downstream through the emissions system. Once exhaust reaches the SCR stage, it contains NOx that must be treated to meet emissions standards.
  • Step 2: DEF is injected into the exhaust stream
    • Upstream of the SCR filter, the system injects Diesel Exhaust Fluid (DEF). DEF is a urea-based fluid that is designed specifically for SCR systems.
  • Step 3: DEF breaks down into ammonia
    • When DEF mixes with hot exhaust, it breaks down into ammonia. This is the key ingredient needed for the SCR reaction to occur.
  • Step 4: SCR catalyst converts NOx
    • Inside OEM 4376889 is a catalyst-coated core. As exhaust passes through it, ammonia reacts with NOx and converts it into:
      • Nitrogen (N₂)
      • Water vapor (H₂O)
  • Step 5: Sensors help regulate efficiency
    • Temperature and NOx sensors monitor the system and help control DEF dosing to keep the SCR process stable and effective.

The Cummins SCR Filter OEM 4376889 works by using DEF and catalyst chemistry to convert NOx into safer emissions for ISF3.8 and QSF3.8 engines from 2011–2020.

The signs of a bad SCR filter (SCR catalyst) usually show up as NOx efficiency faults, DEF-related warnings, and derate conditions. Since the SCR’s job is to reduce NOx emissions using DEF, failure is typically detected through sensor readings and system diagnostics—not by visible damage.

Common signs of a bad SCR filter

  • Check engine light / emissions warning light
    • Often the first sign that the SCR is not meeting emissions requirements.
  • NOx efficiency fault codes
    • Codes such as “SCR efficiency below threshold”, NOx conversion low, or emissions system fault strongly indicate catalyst degradation.
  • Derate / restricted operating mode
    • Many vehicles enter derate (limp mode) when SCR performance drops or faults remain active.
  • Abnormal DEF consumption
    • DEF usage may increase as the system attempts to compensate for poor NOx conversion.
  • Strong ammonia smell (ammonia slip)
    • If DEF is injected but the SCR can’t process it properly, ammonia may pass through the exhaust and create a sharp odor.
  • DEF crystallization or deposits
    • White crusty buildup near the doser/injector or SCR inlet can signal crystallization and restriction.
  • Repeated SCR faults after component repairs
    • If NOx sensors, DEF pump, injector/doser, and wiring are confirmed good but SCR codes keep returning, the SCR filter is likely contaminated or heat-damaged.

A bad SCR filter is most often confirmed by persistent NOx efficiency codes, repeated derate conditions, abnormal DEF behavior, and recurring emissions warnings—and in most cases, replacement is the most reliable solution.

NOx sensors and exhaust temperature sensors monitor exhaust conditions around the SCR filter.

Yes, 4376889 is a genuine Cummins-specified aftertreatment SCR filter assembly.

Yes, the SCR filter assembly can typically be serviced or replaced without changing the entire aftertreatment system.

It targets nitrogen oxides (NOx) in the exhaust stream.

Cummins SCR Filters

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