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Cummins L9 SCR 2018-2021: OEM 5418548

CUMMINS L9 SCR 2018-2021: OEM 5418548

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 NUMBER5418548
PART TYPESCR
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEL9
YEAR2018-2021
PART NUMBER5418548RM-SCR
APPLICATION NOTESAutocar, 250-320, EPA17

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx SCR, Tamerx part number 5418548RM-SCR ( OEM Part Number 5418548 ). 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 OEM5418548
Additional OEM5418548

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490551060
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 to support the emissions system in modern diesel engines, the Cummins L9 SCR (OEM 5418548) is built for 2018–2021 Cummins L9 applications. This component plays an important role in the selective catalytic reduction process, helping manage exhaust gases within the aftertreatment system. Manufactured to meet OEM specifications, it offers dependable compatibility and a direct-fit design for easier installation. A reliable replacement choice for keeping your Cummins L9 exhaust system operating properly.

FITMENT CHART

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

PEOPLE ALSO ASKS | BLOG(S)

Diesel engines rely on exhaust aftertreatment systems to control harmful gases produced during combustion. The Cummins L9 SCR 2018–2021: OEM 5418548 is a Selective Catalytic Reduction (SCR) assembly designed to reduce nitrogen oxide (NOx) emissions within the exhaust system of Cummins L9 engines. By supporting the chemical reaction between diesel exhaust fluid and exhaust gases, this SCR unit helps convert harmful pollutants into nitrogen and water vapor before they leave the tailpipe.

  • Designed for Cummins L9 engines from 2018 to 2021, the OEM 5418548 SCR integrates with the engine’s original aftertreatment system.

  • The catalyst chamber provides the reaction area where diesel exhaust fluid mixes with nitrogen oxide gases in the exhaust stream.

  • As exhaust flows through the catalyst channels, NOx emissions are chemically converted into less harmful compounds.

  • The catalyst substrate contains multiple small passages that increase the surface area where emission-reducing reactions occur.

  • A properly functioning OEM 5418548 SCR assembly helps maintain accurate readings from emission sensors located before and after the catalyst.

  • The SCR system works together with DEF dosing components to manage exhaust chemistry and support emission compliance.

  • The durable housing is designed to tolerate sustained high exhaust temperatures during heavy-duty truck operation.

  • Replacing a restricted or aging SCR unit helps restore proper exhaust gas treatment across the aftertreatment system.

The Cummins L9 SCR 2018–2021: OEM 5418548 from Tamerx Diesel Parts provides a dependable replacement option for maintaining proper exhaust aftertreatment function. With the correct SCR assembly installed, the emission system can continue converting harmful gases effectively while supporting reliable diesel engine operation.

The Selective Catalytic Reduction (SCR) system depends on Diesel Exhaust Fluid (DEF) to properly reduce nitrogen oxide (NOx) emissions. Because the chemical reaction inside the SCR catalyst relies on precise fluid composition, the system is highly sensitive to DEF quality. Using the wrong or contaminated fluid can quickly lead to performance issues and warning lights.

  • DEF must meet strict specifications to ensure the correct urea concentration. Incorrect mixtures can prevent proper NOx reduction and trigger fault codes.

  • Contaminated DEF containing dirt, fuel, oil, or water can damage the DEF injector and affect the catalyst internally.

  • Low-grade or expired DEF may break down over time, reducing its effectiveness in the chemical conversion process.

  • Crystallization caused by improper storage or contamination can clog the DEF injector and disrupt dosing.

  • Poor fluid quality can lead to increased DEF consumption as the system attempts to compensate for reduced efficiency.

  • Persistent use of incorrect DEF may result in catalyst damage, engine derate, or costly SCR replacement.

The SCR system is designed to operate with clean, manufacturer-approved DEF. Proper storage, careful handling, and using only high-quality fluid are essential to maintaining reliable emissions control and protecting the longevity of the SCR system.

Yes, if the Cummins L9 SCR 2018–2021: OEM 5418548 is not functioning properly it can trigger emissions system warning lights or diagnostic codes.

If the Cummins L9 SCR 2018–2021: OEM 5418548 fails, the engine may experience emissions faults and could enter a reduced power mode.

Yes, if the system detects a problem with the Cummins L9 SCR 2018–2021: OEM 5418548, the engine control module may limit engine power.

Using the correct Cummins L9 SCR 2018–2021: OEM 5418548 ensures proper compatibility with the engine and emissions system.

Cummins SCRs