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Cummins X15 SCR 2018-2024: OEM 4394838

CUMMINS X15 SCR 2018-2024: OEM 4394838

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$5,995.00

AVAILABILITY IN STOCK
OEM NUMBER4394838
PART TYPESCR
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEX15
YEAR2018-2024
PART NUMBER202-0290RM-SCR
APPLICATION NOTESNavistar 485-605 EPA21, EPA17

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx SCR, Tamerx part number 202-0290RM-SCR ( OEM Part Number 4394838 ). 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 X15, production years 2018-2024, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM4394838
Additional OEM4394838, A055M234

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490551923
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.


Start every haul with cleaner, smarter performance using the Cummins X15 SCR 2018–2024: OEM 4394838, built to optimize emissions control and fuel efficiency. This genuine OEM Selective Catalytic Reduction unit reduces harmful pollutants while helping your engine run at peak performance under heavy-duty conditions. Engineered for rugged durability and seamless integration, it’s ready to handle the toughest jobs on the road. Trust in quality that keeps your rig compliant and powerful mile after mile.

FITMENT CHART

YEARMAKEENGINE(S)
2018Cummins X15
2019Cummins X15
2020Cummins X15
2021Cummins X15
2022Cummins X15
2023Cummins X15
2024Cummins X15

PEOPLE ALSO ASKS | BLOG(S)

A properly functioning exhaust aftertreatment system is essential for diesel engines to meet emissions standards and maintain dependable operation. The Selective Catalytic Reduction (SCR) assembly is a key component in that system, responsible for reducing harmful nitrogen oxide gases before they leave the exhaust. For Cummins X15 engines built from 2018 through 2024, the Cummins X15 SCR 2018–2024: OEM 4394838 offers a reliable, factory-matched replacement designed to support efficient emissions control and lasting performance.

    • The SCR assembly targets nitrogen oxide (NOx) emissions, converting them into harmless nitrogen and water,
      helping your truck stay compliant with EPA emissions regulations and operate with cleaner exhaust output.

    • The OEM 4394838 SCR unit is engineered specifically for Cummins X15 engines from 2018 to 2024,
      ensuring correct fitment and seamless integration with the original aftertreatment system.

    • Designed to work with the DEF dosing system, this SCR component supports balanced exhaust treatment,
      helping maintain effective NOx reduction and efficient DEF usage throughout driving conditions.

    • Installing the proper OEM SCR assembly helps reduce the likelihood of warning lights, fault codes, and derate conditions,
      minimizing interruptions and unnecessary diagnostic time.

    • A well-maintained SCR system also helps protect other aftertreatment parts by minimizing excessive emissions buildup,
      supporting longer service life and smoother overall operation.

    • Choosing a quality OEM replacement like the Cummins X15 SCR 2018–2024: OEM 4394838 gives you confidence in durability,
      proper system integration, and dependable emissions control performance.

Selecting the right SCR assembly plays a major role in preserving your Cummins X15 exhaust aftertreatment system. The OEM 4394838 SCR unit delivers proper fit and reliable operation to support cleaner emissions, reduce downtime, and help your truck perform at its best. At Tamerx Diesel Parts, we offer trusted diesel components to help keep your engine compliant and road-ready mile after mile.

 

The Selective Catalytic Reduction (SCR) system is a critical part of modern diesel emissions control, helping reduce nitrogen oxide emissions through the use of diesel exhaust fluid (DEF). When SCR-related problems occur, the vehicle’s engine control module will often trigger warning lights or store diagnostic trouble codes. Recognizing these indicators early can help prevent engine derate and costly repairs.

  • Check engine light: One of the most common alerts when the SCR system detects abnormal performance.

  • DEF or SCR warning light: Many vehicles have a dedicated emissions or DEF system warning indicator.

  • NOx sensor fault codes: Codes related to upstream or downstream NOx sensors often point to SCR efficiency problems.

  • DEF dosing or injector codes: Faults involving the DEF injector or dosing module can signal improper exhaust treatment.

  • SCR efficiency codes: Codes indicating low catalyst efficiency suggest the SCR is not reducing emissions effectively.

  • Exhaust temperature or pressure codes: Abnormal sensor readings may indicate restriction, crystallization, or catalyst damage.

  • Engine derate warnings: Some systems provide alerts before power is reduced due to emissions non-compliance.

Warning lights and SCR-related codes should never be ignored, as they often indicate developing emissions system problems. Prompt diagnostics and repair help restore proper SCR function, prevent further damage, and maintain reliable vehicle operation.

The Cummins X15 SCR 2018-2024: OEM 4394838 works with diesel exhaust fluid (DEF) to trigger a chemical reaction that converts NOx into nitrogen and water. This significantly reduces the level of pollutants released from the tailpipe.

Over time, SCR units can become less effective due to wear or contamination from exhaust byproducts. Replacing this component restores correct NOx conversion and emissions control performance.

The SCR uses DEF injected into the exhaust to create a reaction that neutralizes NOx gases. This cooperative action between DEF and the Cummins X15 SCR 2018-2024: OEM 4394838 is essential for reducing emissions.

Yes, professional installation is recommended to ensure proper fitment, sealing, and system integration. A technician can also check related sensors and DEF connections during the process.

Cummins SCRs

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