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Cummins L9 SCR 2018-2021: OEM 5418680

CUMMINS L9 SCR 2018-2021: OEM 5418680

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 NUMBER5418680
PART TYPESCR
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEL9
YEAR2018-2021
PART NUMBER102-0304RM-SCR
APPLICATION NOTESDTNA, 200-320, EPA17

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx SCR, Tamerx part number 102-0304RM-SCR ( OEM Part Number 5418680 ). 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 OEM5418680
Additional OEM5418680

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490551756
WEIGHT500.00 LBS

SHIPPING OPTIONS

Ship Weight : 500.00 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.


Hit the highway with confidence using the Cummins L9 SCR 2018–2021: OEM 5418680, crafted to improve emissions control and fuel efficiency for heavy-duty performance. This genuine OEM Selective Catalytic Reduction unit helps reduce harmful pollutants while optimizing engine operation under demanding conditions. Built tough for long life and seamless fitment, it’s ideal for hardworking rigs. Keep your engine compliant and running strong mile after mile.

FITMENT CHART

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

PEOPLE ALSO ASKS | BLOG(S)

The Selective Catalytic Reduction (SCR) system is a cornerstone of modern diesel exhaust aftertreatment, helping lower harmful nitrogen oxide (NOx) emissions before they leave the tailpipe. For Cummins L9 engines built between 2018 and 2021, the Cummins L9 SCR 2018–2021: OEM 5418680 delivers a factory-matched replacement designed to support effective emissions treatment and dependable operation over the long haul.

    • The SCR assembly targets NOx gases in the exhaust, converting them into harmless nitrogen and water,
      which supports compliance with EPA emissions standards and helps reduce environmental impact.

    • The OEM 5418680 SCR unit is engineered specifically for Cummins L9 engines from 2018–2021,
      ensuring precise fitment and seamless integration with your truck’s original aftertreatment system.

    • Designed to work with the DEF dosing process, this SCR component supports balanced exhaust treatment,
      helping maintain efficient DEF use and steady emissions control under varied driving conditions.

    • Installing the proper OEM SCR part helps reduce the chance of fault codes, warning lights, and derate events,
      which can interrupt operation and lead to unnecessary diagnostics or downtime.

    • A well-functioning SCR system also protects other aftertreatment components by minimizing excessive emissions buildup,
      supporting longer service life and smoother overall performance.

    • Choosing a trusted replacement like the Cummins L9 SCR 2018–2021: OEM 5418680 provides confidence in durability,
      correct system integration, and reliable emissions control performance tailored to your engine.

Selecting the right SCR assembly ensures your Cummins L9’s aftertreatment system operates as designed. The OEM 5418680 SCR unit delivers the proper fit, compatibility, and performance needed to help reduce emissions interruptions and support dependable engine function. At Tamerx Diesel Parts, we offer quality components that help keep your vehicle compliant, efficient, and ready for the road.

An SCR system is built for long-term durability and is designed to function for many years under normal driving conditions. While it does not have a fixed replacement interval, its lifespan depends heavily on maintenance practices, DEF quality, and overall exhaust system health.

  • Typical lifespan range: Many SCR systems last between 250,000 and 500,000 miles.

  • DEF quality is critical: Using clean, manufacturer-approved DEF helps prevent contamination.

  • Upstream component health matters: Proper DOC and DPF operation protects the SCR from excess soot and ash.

  • Driving habits affect longevity: Regular highway driving supports proper exhaust temperatures.

  • Sensor and dosing reliability: Functional NOx sensors and DEF injectors help maintain system efficiency.

  • Prompt repair of warning signs: Addressing minor issues early helps prevent premature failure.

With proper maintenance and DEF management, an SCR system can last a significant portion of the vehicle’s lifespan. Proactive care ensures reliable emissions performance and helps avoid unexpected repairs.

A failing Cummins L9 SCR 2018-2021: OEM 5418680 can trigger fault codes, warning lights, or unexpected derates. Reduced engine performance or abnormal emissions readings can also indicate issues.

The Cummins L9 SCR 2018-2021: OEM 5418680 actively lowers NOx emissions before exhaust exits the system. Proper SCR operation plays a key role in meeting environmental standards.

Routine inspection of the Cummins L9 SCR 2018-2021: OEM 5418680 helps catch wear, clogging, or sensor issues early. Timely checks can prevent sudden failures or warnings.

A clogged Cummins L9 SCR 2018-2021: OEM 5418680 can disrupt exhaust flow and reduce emissions performance. This often leads to diagnostic alerts and reduced operational efficiency.

Cummins SCRs