Cummins QSX15 SCR Outlet Catalyst Module 2018-2024: OEM 5418386
CUMMINS QSX15 SCR OUTLET CATALYST MODULE 2018-2024: OEM 5418386
ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY
WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Remanufactured Tamerx SCR Outlet Catalyst Module, Tamerx part number 5418386RM-SCR ( OEM Part Number 5418386 ). 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 QSX15, production years 2018-2024, and comes with a One Million Miles or One Year Warranty.
OEM NUMBERS
| Primary OEM | 5418386 |
| Additional OEM | 5418386 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490553415 |
| WEIGHT | 88.00 LBS |
SHIPPING OPTIONS
Ship Weight : 88.00 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 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, 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 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.
Engineered for compatibility with 2018–2024 Cummins QSX15 engines, the Cummins QSX15 SCR Outlet Catalyst Module (OEM 5418386) is a vital component of the diesel exhaust aftertreatment system. This Selective Catalytic Reduction (SCR) filter works with diesel exhaust fluid (DEF) to convert nitrogen oxides in the exhaust stream into less harmful gases before they exit the vehicle. Manufactured to meet original equipment specifications, it is designed for proper fitment and dependable integration with existing emissions components. The durable construction is built to withstand high temperatures and demanding operating conditions commonly found in heavy-duty diesel applications. Replacing a worn or restricted SCR filter with the OEM 5418386 helps maintain proper exhaust aftertreatment function and supports compliance with emissions regulations.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2018 | Cummins | QSX15 | ||||
| 2019 | Cummins | QSX15 | ||||
| 2020 | Cummins | QSX15 | ||||
| 2021 | Cummins | QSX15 | ||||
| 2022 | Cummins | QSX15 | ||||
| 2023 | Cummins | QSX15 | ||||
| 2024 | Cummins | QSX15 | ||||
PEOPLE ALSO ASKS | BLOG(S)
The Cummins QSX15 SCR Outlet Catalyst Module (OEM 5418386) is an important component of a diesel engine’s exhaust aftertreatment system. Its main purpose is to help reduce harmful nitrogen oxide (NOx) emissions through the Selective Catalytic Reduction (SCR) process.
One important fitment note: available product information for OEM 5418386 identifies it primarily with Cummins X12 and X15 applications for 2018–2022, rather than specifically confirming QSX15 fitment through 2024. Exact compatibility should therefore be verified using the engine serial number before installation.
What Does the Cummins 5418386 SCR Outlet Catalyst Module Do?
- Reduces harmful NOx emissions
- The SCR catalyst provides the environment where ammonia derived from Diesel Exhaust Fluid (DEF) reacts with NOx, converting it primarily into nitrogen and water vapor.
- Handles a late stage of exhaust treatment
- Exhaust reaches the SCR system after passing through upstream aftertreatment processes, allowing the catalyst to concentrate on reducing NOx.
- Works together with DEF
- DEF is introduced upstream of the SCR catalyst. Exhaust heat helps convert it into ammonia, which is necessary for the NOx-reduction reaction.
- Supports the complete aftertreatment system
- The catalyst works alongside components such as the DOC, DPF, DEF dosing equipment, NOx sensors, and temperature sensors.
- Helps maintain proper emissions performance
- An efficient SCR catalyst helps the engine’s emissions system achieve the NOx conversion levels expected by its electronic controls.
- Handles demanding exhaust conditions
- The module is constructed to operate in the high-temperature environment found in heavy-duty diesel exhaust systems.
Signs the SCR Catalyst May Need Attention
Problems elsewhere in the aftertreatment system can sometimes appear as an SCR catalyst issue. NOx efficiency fault codes, repeated emissions warnings, DEF-related faults, or engine derates should be properly diagnosed before replacing the catalyst. DEF dosing, sensors, upstream DOC/DPF performance, and exhaust leaks should also be checked.
Keeping the Aftertreatment System Working Properly
The Cummins SCR Outlet Catalyst Module (OEM 5418386) plays a major role in the final stages of exhaust cleanup. Keeping the DEF system functioning correctly and addressing aftertreatment faults early can help protect the catalyst and maintain dependable emissions performance. For this particular OEM number, confirming the exact engine and model-year application before replacement is especially important.
An SCR Outlet Catalyst Module typically does not have a fixed replacement interval. Unlike filters and other routine maintenance parts, it is generally replaced based on its condition and performance rather than at a specific mileage.
A properly functioning catalyst can remain in service for many years. Operating conditions, engine health, DEF quality, and aftertreatment maintenance all influence how long it lasts.
Here are some signs that replacement may be necessary:
- Recurring SCR efficiency fault codes
- If catalyst-related codes repeatedly return after sensors and other SCR components have been checked, the module may be deteriorating.
- Poor NOx conversion efficiency
- Diagnostic testing may show that the catalyst is no longer reducing NOx emissions effectively.
- Engine derate or reduced-power conditions
- Persistent SCR faults can eventually cause some diesel engines to limit power or operation.
- Physical catalyst damage
- A cracked, melted, or otherwise damaged internal substrate generally requires module replacement.
- Severe contamination
- Oil, coolant, excessive soot, or DEF-related deposits can damage or poison the catalyst and reduce its effectiveness.
- Problems that remain after other SCR repairs
- If the DEF dosing system, NOx sensors, wiring, and exhaust system are operating correctly but SCR efficiency remains low, the catalyst module should be evaluated.
Instead of replacing your SCR Outlet Catalyst Module according to mileage alone, have it inspected when SCR-related symptoms or fault codes appear. Proper DEF, regular engine maintenance, and quickly correcting upstream problems can help the catalyst module remain effective for as long as possible.
Yes. Its designation as an SCR Outlet Catalyst Module reflects its role in the downstream portion of the aftertreatment process. Exhaust has already passed through earlier treatment stages before completing NOx treatment in the SCR section.
Yes. Contaminated, diluted, or otherwise incorrect DEF can interfere with SCR operation and contribute to deposits or inadequate NOx conversion. DEF quality should therefore be checked when diagnosing catalyst-efficiency problems.
Yes. DEF deposits or crystallization upstream of the catalyst can interfere with DEF distribution and decomposition. This can contribute to poor SCR efficiency even when the catalyst itself is not the original cause of the problem.
Yes. An under-dosing, over-dosing, leaking, or poorly atomizing DEF injector can cause SCR performance problems. Checking dosing performance can prevent unnecessary replacement of a functional 5418386 catalyst.
Cummins SCR Outlet Catalyst Modules
