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Cummins X15 SCR 2018-2021: OEM 5418109

CUMMINS X15 SCR 2018-2021: OEM 5418109

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 NUMBER5418109
PART TYPESCR
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEX15
YEAR2018-2021
PART NUMBER5418109RM-SCR
APPLICATION NOTESNavistar, 485-565, EPA17

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx SCR, Tamerx part number 5418109RM-SCR ( OEM Part Number 5418109 ). 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 OEM5418109
Additional OEM5418109

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490552173
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.


Designed for Cummins X15 engines from model years 2018–2021, OEM 5418109 is a selective catalytic reduction component that supports proper exhaust emissions control and EPA compliance. This SCR unit is engineered for accurate fitment and smooth integration with the factory aftertreatment system. Built with durable materials, it is suited for the high-temperature conditions common in heavy-duty diesel applications. The component helps maintain consistent aftertreatment operation while meeting OEM specifications. It is an ideal option for fleet maintenance and targeted repair needs requiring reliable emissions management.

FITMENT CHART

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

PEOPLE ALSO ASKS | BLOG(S)

The Cummins X15 SCR 2018–2021, OEM 5418109, plays a critical role in modern emissions control systems used in heavy-duty diesel trucks. This component is part of the Selective Catalytic Reduction system, which is designed to treat exhaust gases before they exit the vehicle. Its primary purpose is to help vehicles meet federal and state emissions regulations during daily operation.

Positioned near the end of the aftertreatment system, OEM 5418109 supports the chemical process that targets nitrogen oxide emissions. When Diesel Exhaust Fluid is introduced upstream, the SCR catalyst enables a reaction that converts harmful exhaust gases into nitrogen and water vapor. This process significantly reduces the environmental impact of on-highway diesel applications.

Built specifically for Cummins X15 engines from 2018 to 2021, this SCR module is engineered for precise fitment and compatibility with surrounding aftertreatment components. Proper operation of this part is essential for maintaining emissions compliance and avoiding system faults.

Key roles of the Cummins X15 SCR OEM 5418109 include:

  • Reducing nitrogen oxide emissions
  • Supporting EPA and CARB compliance
  • Working alongside DEF dosing systems
  • Helping prevent emissions-related fault codes

For fleet managers and owner-operators, a reliable SCR system helps ensure consistent vehicle operation and minimizes downtime related to emissions issues. OEM 5418109 remains a vital component in keeping Cummins X15 platforms compliant and dependable.

The main cause of SCR (Selective Catalytic Reduction) failure in diesel engines is poor-quality or contaminated Diesel Exhaust Fluid (DEF). SCR systems rely on precise chemical reactions to convert harmful nitrogen oxides (NOx) into harmless nitrogen and water. When DEF becomes contaminated, degraded, or incorrectly formulated, that process breaks down and causes emissions failures.

DEF contamination can occur from improper storage, exposure to heat or sunlight, use of non-certified fluid, or accidental mixing with water, fuel, coolant, or dirt. Even minor contamination can lead to crystallization inside the DEF injector and dosing lines, restricting flow and preventing proper ammonia delivery to the SCR catalyst. Over time, this causes reduced NOx conversion efficiency and persistent fault codes.

While DEF issues are the leading cause, SCR failure is often accelerated by unresolved upstream engine problems. Midway through the failure process, the most common contributing factors include:

  • Contaminated or incorrect DEF fluid
  • DEF crystallization clogging injectors
  • Faulty NOx or exhaust temperature sensors
  • Excessive oil consumption or coolant leaks
  • Overheating from failed regeneration events

In most cases, the SCR catalyst itself does not fail due to age or wear. Instead, it becomes poisoned or thermally damaged because underlying issues were left uncorrected. Proper DEF handling, early diagnostics, and timely repair of engine and emissions components are essential to preventing SCR failure and avoiding costly replacements.

It serves as the selective catalytic reduction unit for Cummins X15 engines from model years 2018 to 2021.

Yes, the unit comes complete with its internal catalyst media necessary for treating exhaust gases.

Yes, it is designed to connect seamlessly with existing exhaust sensors on supported engines.

It replaces the original selective catalytic reduction assembly in the exhaust aftertreatment system.

Cummins SCRs