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Cummins L9 SCR 2018-2021: OEM 5418544

CUMMINS L9 SCR 2018-2021: OEM 5418544

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 NUMBER5418544
PART TYPESCR
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEL9
YEAR2018-2021
PART NUMBER5418544RM-SCR
APPLICATION NOTESE-ONE, 250-320, EPA17

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx SCR, Tamerx part number 5418544RM-SCR ( OEM Part Number 5418544 ). 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 L9, production years 2018-2021, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM5418544
Additional OEM5418544

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490550995
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.


Maintain proper emissions system operation with the Cummins L9 SCR (OEM 5418544) designed for 2018–2021 Cummins L9 engines. This SCR unit works within the selective catalytic reduction system to help manage exhaust gases and support emissions control. Built to meet OEM specifications, it ensures dependable compatibility and a direct-fit installation. A reliable replacement option for keeping your Cummins L9 aftertreatment system functioning as intended.

FITMENT CHART

YEARMAKEENGINE(S)
2018Cummins L9
2019Cummins L9
2020Cummins L9
2021Cummins L9

PEOPLE ALSO ASKS | BLOG(S)

Diesel engines equipped with modern emissions technology rely on several components to process exhaust gases before they are released into the atmosphere. The Cummins L9 SCR 2018–2021: OEM 5418544 is part of the Selective Catalytic Reduction system used in Cummins L9 engines. This SCR catalyst helps reduce nitrogen oxide emissions by allowing a controlled reaction between exhaust gases and Diesel Exhaust Fluid within the aftertreatment system.

  • The Cummins L9 SCR OEM 5418544 operates as a catalyst module positioned in the later stage of the exhaust aftertreatment process.

  • Diesel Exhaust Fluid (DEF) is introduced into the exhaust stream ahead of the SCR catalyst to begin the emissions treatment process.

  • Inside the SCR unit, DEF interacts with nitrogen oxide gases, converting them into nitrogen and water vapor.

  • The SCR assembly works in coordination with other emissions components such as the diesel oxidation catalyst (DOC), diesel particulate filter (DPF), and DEF dosing injector.

  • OEM 5418544 is designed specifically for Cummins L9 engines produced from 2018 to 2021, aligning with the factory aftertreatment system layout.

  • Its durable catalyst housing is built to withstand high exhaust temperatures and constant exposure to exhaust gases.

Efficient emissions control depends on each aftertreatment component performing its role within the exhaust system. The Cummins L9 SCR 2018–2021: OEM 5418544 is engineered to fit the Cummins L9 emissions system and support the reduction of harmful exhaust pollutants. Customers looking for reliable replacement emissions components can find this SCR assembly available from Tamerx Diesel Parts.

The Selective Catalytic Reduction (SCR) system is carefully monitored by your vehicle’s onboard diagnostics to ensure proper emissions control. When something goes wrong, the system will alert you through dashboard warning lights or messages. Recognizing these indicators early can help prevent reduced engine power, emissions failures, and costly repairs.

  • The check engine light is one of the most common indicators of an SCR-related issue. Faults involving DEF dosing, NOx sensors, or catalyst efficiency can trigger this warning.

  • An SCR warning light or message may appear on vehicles equipped with a dedicated emissions alert. This often points directly to a malfunction within the SCR system.

  • A DEF warning light can signal low fluid levels, contaminated DEF, or incorrect fluid quality, all of which can affect SCR performance.

  • A countdown message or “engine restart limited” alert may appear if the system detects a serious fault that has not been corrected.

  • In some cases, a reduced power or derate warning will activate, indicating the vehicle has limited performance due to an unresolved emissions issue.

If any of these warning lights appear, it’s important to have the vehicle diagnosed as soon as possible. Addressing SCR-related problems promptly helps maintain emissions compliance, prevent further aftertreatment damage, and keep your diesel engine operating reliably.

Yes, the Cummins L9 SCR 2018–2021: OEM 5418544 is an important component of the diesel emissions aftertreatment system.

The Cummins L9 SCR 2018–2021: OEM 5418544 works with DEF injectors, sensors, and other aftertreatment components.

Yes, contaminated or incorrect DEF fluid can reduce the effectiveness of the Cummins L9 SCR 2018–2021: OEM 5418544.

Yes, the Cummins L9 SCR 2018–2021: OEM 5418544 helps the vehicle meet emissions standards.

Cummins SCRs