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Cummins L9 SCR 2018-2021: OEM 5418684

CUMMINS L9 SCR 2018-2021: OEM 5418684

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 NUMBER5418684
PART TYPESCR
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEL9
YEAR2018-2021
PART NUMBER5418684RM-SCR
APPLICATION NOTESAutocar, 250-320, EPA17

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx SCR, Tamerx part number 5418684RM-SCR ( OEM Part Number 5418684 ). 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 OEM5418684
Additional OEM5418684

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490551206
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.


Reliable emissions control starts with the Cummins L9 SCR 2018–2021: OEM 5418684, designed to support cleaner exhaust output in heavy-duty diesel applications. This SCR unit plays a key role in the aftertreatment system by helping convert harmful nitrogen oxides into less harmful gases during operation. Manufactured to meet OEM specifications, it provides dependable fitment and durability for Cummins L9 engines. Count on a trusted component that helps maintain efficient performance and emissions compliance on every route.

FITMENT CHART

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

PEOPLE ALSO ASKS | BLOG(S)

Emission control systems depend on several exhaust components working together to treat gases produced during diesel combustion. The Cummins L9 SCR 2018–2021: OEM 5418684 is a Selective Catalytic Reduction (SCR) assembly designed to reduce nitrogen oxide (NOx) emissions produced by Cummins L9 engines. Installed within the aftertreatment system, this SCR unit helps convert harmful exhaust gases into nitrogen and water vapor through a catalytic chemical reaction supported by diesel exhaust fluid (DEF).

  • Designed for Cummins L9 engines from 2018 to 2021, the OEM 5418684 SCR integrates with the engine’s factory aftertreatment configuration.

  • The catalyst chamber inside the SCR provides the surface where DEF reacts with nitrogen oxide gases in the exhaust stream.

  • As exhaust flows through the catalyst structure, chemical reactions break down NOx emissions into less harmful compounds.

  • The internal catalyst substrate contains porous channels that increase surface area for consistent gas treatment.

  • A properly functioning OEM 5418684 SCR assembly supports balanced readings from upstream and downstream emission sensors.

  • The SCR unit works together with DEF dosing components and other exhaust aftertreatment parts to manage emission levels.

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

  • Replacing a restricted or contaminated SCR unit can help restore proper exhaust gas processing within the emission system.

The Cummins L9 SCR 2018–2021: OEM 5418684 from Tamerx Diesel Parts offers a dependable replacement option for maintaining proper exhaust aftertreatment operation. Installing the correct SCR assembly helps support consistent emission control and reliable exhaust system performance.

The Selective Catalytic Reduction (SCR) system helps reduce nitrogen oxide (NOx) emissions by injecting Diesel Exhaust Fluid (DEF) into the exhaust stream. Over time, certain conditions can lead to buildup or restriction within the system, affecting its ability to function properly. Preventing SCR clogging starts with proper maintenance and addressing small issues before they turn into larger problems.

  • Always use clean, manufacturer-approved DEF. Contaminated or low-quality fluid can leave deposits that interfere with proper chemical reactions inside the catalyst.

  • Store DEF in sealed containers and protect it from dirt, moisture, and extreme temperatures to maintain fluid quality.

  • Inspect the DEF injector regularly for crystallization buildup, which can restrict proper spray patterns and dosing.

  • Address Diesel Particulate Filter (DPF) issues promptly, as excessive soot or failed regenerations can impact exhaust flow and affect SCR performance.

  • Repair engine problems such as oil consumption or coolant leaks quickly to prevent internal contamination of the aftertreatment system.

  • Monitor and respond to warning lights or fault codes early instead of delaying diagnostics.

  • Follow scheduled maintenance intervals to check sensors, filters, and related emissions components.

Preventing SCR clogging depends on consistent upkeep and proper DEF handling. By maintaining the entire exhaust aftertreatment system and resolving issues promptly, you can help ensure reliable emissions control and extend the life of the SCR system.

Persistent codes may appear when NOx levels remain high after the catalyst stage. This may indicate catalyst deterioration or problems with sensors or DEF delivery.

Technicians usually check fault codes using diagnostic tools and review sensor data. They may also inspect DEF quality and the condition of the exhaust system.

Yes, faulty NOx or temperature sensors can send incorrect readings to the control module. This can cause incorrect DEF dosing and emissions faults.

The catalyst converts nitrogen oxide gases into nitrogen and water vapor through a chemical reaction. This significantly reduces harmful pollutants released into the air.

Cummins SCRs