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Cummins ISL SCR Outlet Catalyst Module 2018-2022: OEM 4394724

CUMMINS ISL SCR OUTLET CATALYST MODULE 2018-2022: OEM 4394724

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$6,995.00

CORE CHARGE:

$1,000.00
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 NUMBER4394724
PART TYPESCR Outlet Catalyst Module
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEISL
YEAR2018-2022
PART NUMBER4394724Rm-SCR

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx SCR Outlet Catalyst Module, Tamerx part number 4394724Rm-SCR ( OEM Part Number 4394724 ). 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 ISL, production years 2018-2022, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM4394724
Additional OEM4394724

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490556805
WEIGHT78.00 LBS

SHIPPING OPTIONS

Ship Weight : 78.00 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.


Built for cleaner exhaust performance, the Cummins ISL SCR Outlet Catalyst Module 2018–2022 (OEM 4394724) helps your emissions system operate with confidence. Designed specifically for Cummins ISL engines, this SCR outlet catalyst module supports effective NOx reduction while promoting reliable aftertreatment system function. Manufactured to OEM specifications, it provides precise fitment and dependable compatibility across the listed model years. Installing the correct SCR outlet catalyst module helps maintain proper exhaust flow, consistent emissions compliance, and long-lasting durability.

FITMENT CHART

YEARMAKEENGINE(S)
2018Cummins ISL
2019Cummins ISL
2020Cummins ISL
2021Cummins ISL
2022Cummins ISL

PEOPLE ALSO ASKS | BLOG(S)

The Cummins ISL SCR Outlet Catalyst Module 2018-2022 OEM 4394724 is an essential part of the diesel aftertreatment system, helping ensure exhaust gases are properly treated before leaving the vehicle. One of the most searched topics related to SCR outlet catalyst modules is how they contribute to long-term emissions system reliability. Choosing an OEM replacement helps maintain factory compatibility and dependable operation throughout the entire exhaust aftertreatment system.

  • OEM 4394724 is designed for 2018-2022 Cummins ISL engine applications, providing a precise OEM-style fit for compatible vehicles.
  • Supports the final stage of the Selective Catalytic Reduction (SCR) system, helping complete the exhaust gas treatment process.
  • Designed to work seamlessly with factory aftertreatment components, maintaining proper integration with the original emissions system.
  • Manufactured with durable catalyst materials engineered to withstand prolonged exposure to high diesel exhaust temperatures.
  • Promotes consistent exhaust gas flow, supporting efficient operation of the complete aftertreatment assembly.
  • Direct-fit construction simplifies installation, matching original mounting points and exhaust connections.
  • Built for dependable long-term durability, making it a reliable replacement for restoring proper SCR outlet catalyst function.

The Cummins ISL SCR Outlet Catalyst Module 2018-2022 OEM 4394724 is a dependable choice for maintaining the reliability of your diesel emissions system. With its OEM-quality construction, precise fitment, and durable catalyst design, it helps support efficient exhaust aftertreatment while keeping your Cummins-powered vehicle operating as intended.

Yes, a bad SCR Outlet Catalyst Module can trigger the check engine light. As part of the Selective Catalytic Reduction (SCR) system, the module helps monitor catalyst efficiency and supports proper nitrogen oxide (NOx) emissions control. If it fails or provides incorrect data, the engine control module can detect the problem and illuminate the check engine light.

  • The check engine light may come on when the module detects reduced SCR efficiency or a catalyst-related fault.
  • Diagnostic trouble codes related to SCR performance, NOx reduction, or catalyst efficiency are commonly stored.
  • An SCR warning light or emissions system message may also appear alongside the check engine light.
  • Incorrect module readings can affect Diesel Exhaust Fluid (DEF) dosing and overall SCR system operation.
  • If the fault remains unresolved, the vehicle may enter reduced power or engine derate mode.
  • Problems with related components, such as NOx sensors, DEF injectors, or wiring harnesses, can trigger similar warning lights and should also be inspected.
  • A complete diagnostic scan is recommended to determine whether the SCR Outlet Catalyst Module or another aftertreatment component is causing the fault.

A bad SCR Outlet Catalyst Module can certainly trigger the check engine light, but accurate diagnosis is essential to identify the root cause. Repairing the issue promptly helps restore emissions system performance, maintain engine efficiency, and prevent additional aftertreatment damage.

Yes, insufficient DEF limits the SCR system's ability to reduce NOx emissions. Continued operation may trigger warning lights or engine derate conditions.

Technicians should look for dents, cracks, corrosion, and damaged mounting points. Physical damage can affect catalyst performance and exhaust sealing.

Yes, if the SCR system cannot reduce emissions properly, the engine may enter derate mode. A complete emissions system diagnosis is recommended to identify the cause.

A clean DEF filter helps ensure proper fluid delivery to the SCR system. Restricted DEF flow can reduce catalyst efficiency and trigger fault codes.

Cummins SCR Outlet Catalyst Modules