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Cummins L9 SCR 2018-2021: OEM 5418649

CUMMINS L9 SCR 2018-2021: OEM 5418649

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 NUMBER5418649
PART TYPESCR
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEL9
YEAR2018-2021
PART NUMBER5418649RM-SCR-2
APPLICATION NOTESDTNA, 250-320, EPA17

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx SCR, Tamerx part number 5418649RM-SCR-2 ( OEM Part Number 5418649 ). 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 OEM5418649
Additional OEM5418649

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490551145
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.


When it comes to maintaining proper exhaust aftertreatment, the Cummins L9 SCR (OEM 5418649) is built to support 2018–2021 Cummins L9 engines. This SCR unit works as part of the selective catalytic reduction system, helping manage exhaust gases and maintain emissions system function. Manufactured to meet OEM specifications, it provides reliable compatibility and a direct-fit design for straightforward installation. A dependable replacement option for keeping your Cummins L9 emissions system operating properly.

FITMENT CHART

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

PEOPLE ALSO ASKS | BLOG(S)

Modern diesel engines rely on several emissions components working together to properly treat exhaust gases. The Cummins L9 SCR 2018–2021: OEM 5418649 is designed as part of this system, helping manage nitrogen oxide emissions produced during combustion. As a Selective Catalytic Reduction (SCR) catalyst module, it works with the DEF system to complete the final stage of exhaust treatment in Cummins L9 powered trucks.

  • The Cummins L9 SCR OEM 5418649 acts as a catalyst chamber where treated exhaust gases pass through before leaving the aftertreatment system.

  • It operates alongside the Diesel Exhaust Fluid (DEF) system, allowing DEF to react with nitrogen oxide gases inside the catalyst.

  • Through this chemical process, harmful NOx emissions are converted into nitrogen and water vapor.

  • The SCR unit is engineered to integrate with the truck’s exhaust sensors and DEF dosing components to maintain proper emissions system operation.

  • Built for Cummins L9 engines from 2018–2021, OEM 5418649 matches the factory exhaust configuration for proper installation.

  • The SCR housing is designed to withstand constant exposure to hot exhaust gases within the aftertreatment system.

Maintaining the SCR catalyst is an important part of keeping the diesel emissions system functioning correctly. The Cummins L9 SCR 2018–2021: OEM 5418649 provides the proper fit and compatibility required for the Cummins L9 aftertreatment system. For customers searching for dependable emissions components, Tamerx Diesel Parts offers this SCR assembly designed to meet OEM specifications.

The Selective Catalytic Reduction (SCR) system plays a key role in reducing harmful emissions in modern diesel engines. By injecting Diesel Exhaust Fluid (DEF) into the exhaust stream, the SCR system helps convert nitrogen oxides (NOx) into less harmful gases. When the SCR system stops working properly, it can lead to noticeable performance issues, warning lights, and even vehicle derating. Understanding what happens when SCR fails can help you address problems early and avoid costly downtime.

  • One of the first signs of an SCR malfunction is a dashboard warning light. The system continuously monitors DEF levels, NOx sensors, and overall efficiency. If it detects a fault, it will alert the driver immediately.

  • Many diesel vehicles are programmed to reduce engine power if the SCR system fails. This “derate” mode limits speed and performance to encourage prompt repairs and maintain emissions compliance.

  • Without a functioning SCR system, harmful nitrogen oxide (NOx) emissions increase significantly. This can cause the vehicle to fail emissions testing and may result in fines or operational restrictions in regulated areas.

  • Faulty sensors, clogged DEF injectors, or contaminated DEF fluid can cause improper dosing. This may trigger repeated fault codes or excessive DEF usage.

  • Ignoring SCR issues can place additional strain on other emissions components, including the Diesel Particulate Filter (DPF). Over time, this can lead to more extensive and costly repairs.

If your SCR system stops working, it’s important to address the issue quickly. From warning lights and reduced power to increased emissions and possible derating, SCR problems can impact both vehicle operation and compliance. Regular maintenance, proper DEF handling, and timely repairs help keep your diesel engine running reliably and within emissions standards.

Yes, soot, ash, or DEF deposits can build up inside the Cummins L9 SCR 2018–2021: OEM 5418649 and reduce its efficiency.

Yes, the Cummins L9 SCR 2018–2021: OEM 5418649 helps engines meet strict emissions standards by lowering NOx output.

Yes, contaminated or incorrect DEF can reduce the effectiveness of the Cummins L9 SCR 2018–2021: OEM 5418649.

Yes, if the Cummins L9 SCR 2018–2021: OEM 5418649 becomes restricted, it may affect exhaust flow and emissions system performance.

Cummins SCRs