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Cummins X15 SCR 2018-2021: OEM 4394757

CUMMINS X15 SCR 2018-2021: OEM 4394757

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$4,995.00

AVAILABILITY IN STOCK
OEM NUMBER4394757
PART TYPESCR
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEX15
YEAR2018-2021
PART NUMBER4394757RM-SCR
APPLICATION NOTESAutocar, 485-565, EPA17

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx SCR, Tamerx part number 4394757RM-SCR ( OEM Part Number 4394757 ). 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 2018-2021, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM4394757
Additional OEM4394757

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490551954
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.


Step into cleaner, more compliant performance with the Cummins X15 SCR 2018–2021: OEM 4394757, engineered to effectively reduce NOx emissions while supporting optimized engine operation. This genuine SCR module meets strict OEM standards for a perfect fit and rugged durability you can rely on in heavy-duty applications. Designed to handle demanding routes and long hauls, it helps keep your truck running efficiently and within emissions regulations. Upgrade to a solution that works as hard as your X15 engine—mile after mile.

FITMENT CHART

YEARMAKEENGINE(S)
2018Cummins X15
2019Cummins X15
2020Cummins X15
2021Cummins X15

PEOPLE ALSO ASKS | BLOG(S)

Keeping your truck’s emission aftertreatment system functioning properly is essential for meeting environmental standards and avoiding service interruptions. The Cummins X15 SCR 2018–2021: OEM 4394757 is a core component of the Selective Catalytic Reduction (SCR) system that helps reduce harmful nitrogen oxides (NOx) in diesel exhaust. Understanding how this SCR unit works and why proper maintenance matters can help you protect your truck and maintain compliance mile after mile.

  • Designed for Cummins X15 engines from 2018 through 2021, the OEM 4394757 SCR unit fits directly into the emission aftertreatment system for precise compatibility.

  • The SCR (Selective Catalytic Reduction) system injects diesel exhaust fluid (DEF) into the exhaust stream, where a chemical reaction converts NOx into harmless nitrogen and water vapor.

  • Using the genuine OEM 4394757 SCR ensures proper integration with your engine’s emission controls, helping reduce the chance of diagnostic trouble codes related to emission faults.

  • A properly functioning SCR helps maintain accurate DEF dosing, which supports efficient NOx reduction and helps prevent unnecessary DEF waste.

  • Regular inspection of the SCR unit as part of routine maintenance can help you spot signs of wear or contamination before they lead to service lights or emission warnings.

  • Replacing a compromised SCR component with the correct OEM part helps avoid issues like false fault codes or system derates that can interrupt daily operation.

  • Manufactured to Cummins’ exact specifications, this SCR module is built to handle the heat and vibration typical of long-haul and regional trucking.

  • Easy installation makes it a practical choice for technicians and fleet service crews when servicing emission system components.

Choosing the Cummins X15 SCR 2018–2021: OEM 4394757 from Tamerx Diesel Parts gives you confidence that your emission control system is equipped with a high-quality, engine-specific component. Paying attention to SCR function and timely replacement with genuine OEM parts helps keep your truck emission-compliant, dependable, and ready for the road ahead.

The Selective Catalytic Reduction (SCR) system helps reduce nitrogen oxide (NOx) emissions by injecting Diesel Exhaust Fluid (DEF) into the exhaust stream. Over time, certain conditions can lead to buildup or restriction within the system, affecting its ability to function properly. Preventing SCR clogging starts with proper maintenance and addressing small issues before they turn into larger problems.

  • Always use clean, manufacturer-approved DEF. Contaminated or low-quality fluid can leave deposits that interfere with proper chemical reactions inside the catalyst.

  • Store DEF in sealed containers and protect it from dirt, moisture, and extreme temperatures to maintain fluid quality.

  • Inspect the DEF injector regularly for crystallization buildup, which can restrict proper spray patterns and dosing.

  • Address Diesel Particulate Filter (DPF) issues promptly, as excessive soot or failed regenerations can impact exhaust flow and affect SCR performance.

  • Repair engine problems such as oil consumption or coolant leaks quickly to prevent internal contamination of the aftertreatment system.

  • Monitor and respond to warning lights or fault codes early instead of delaying diagnostics.

  • Follow scheduled maintenance intervals to check sensors, filters, and related emissions components.

Preventing SCR clogging depends on consistent upkeep and proper DEF handling. By maintaining the entire exhaust aftertreatment system and resolving issues promptly, you can help ensure reliable emissions control and extend the life of the SCR system.

Replacement may be needed due to internal wear, clogging, or repeated fault codes. Over time, emissions components can lose efficiency and require service.

Monitoring DEF quality and responding to warning lights early can extend its service life. Routine checks help catch small issues before they become major problems.

Yes, unresolved emissions issues can lead to restricted operation or service interruptions. Keeping the SCR in good condition helps reduce unexpected downtime.

Ignoring warnings can lead to reduced performance or compliance issues. Prompt attention helps maintain reliable vehicle operation.

Cummins SCRs