
Cummins QSK SCR Outlet Catalyst Module 2018-2024: OEM 4354188
CUMMINS QSK SCR OUTLET CATALYST MODULE 2018-2024: OEM 4354188

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Genuine New, Tamerx SCR Outlet Catalyst Module, Tamerx part number 4354188RM-SCR ( OEM Part Number 4354188 ).This part is primarily made for a Cummins QSK, production years 2018-2024, and comes with a One Million Miles or One Year Warranty.
Additional Notes: Outlet Catalyst Muffler, Type CES 4000 SCR
OEM NUMBERS
| Primary OEM | 4354188 |
| Additional OEM | 4354188, A049H018 |
ADDITIONAL DETAILS
| CONDITION | Genuine New |
| UPC / Barcode | 00840490558373 |
| WEIGHT | 300.00 LBS |
SHIPPING OPTIONS
Ship Weight : 300.00 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.
Restore proper exhaust aftertreatment function with this Cummins QSK SCR Outlet Catalyst Module for 2018–2024 applications. OEM 4354188 helps reduce nitrogen oxide emissions through the SCR system for effective exhaust treatment. A dependable replacement for damaged, restricted, or failing catalyst modules in compatible Cummins QSK engines.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2018 | Cummins | QSK | ||||
| 2019 | Cummins | QSK | ||||
| 2020 | Cummins | QSK | ||||
| 2021 | Cummins | QSK | ||||
| 2022 | Cummins | QSK | ||||
| 2023 | Cummins | QSK | ||||
| 2024 | Cummins | QSK | ||||
PEOPLE ALSO ASKS | BLOG(S)
Incomplete exhaust treatment can occur when an SCR catalyst becomes contaminated, damaged, or unable to process nitrogen oxides effectively. The Cummins QSK SCR Outlet Catalyst Module 2018-2024: OEM 4354188 provides a dedicated catalyst section that helps complete the selective catalytic reduction process, allowing treated exhaust gases to pass through the aftertreatment system while reducing harmful NOx emissions.
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OEM 4354188 is intended for compatible 2018-2024 Cummins QSK diesel applications.
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SCR exhaust treatment helps convert nitrogen oxides (NOx) into nitrogen and water vapor through catalytic reactions.
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Catalyst-coated substrate provides the reactive surface necessary for treating exhaust gases during the SCR process.
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Final-stage NOx reduction helps process remaining nitrogen oxides as exhaust moves through the outlet catalyst section.
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Structured internal passages allow exhaust gases to travel through the catalyst while maintaining contact with active surfaces.
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DEF-based chemical treatment works with ammonia generated from diesel exhaust fluid to facilitate NOx conversion.
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High-temperature-resistant construction accommodates the demanding thermal conditions found in diesel aftertreatment systems.
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Protective catalyst housing helps shield the internal substrate from vibration and physical damage.
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Application-specific configuration helps maintain proper alignment with compatible Cummins QSK exhaust components.
The Cummins QSK SCR Outlet Catalyst Module OEM 4354188 provides an essential catalyst section for completing diesel exhaust treatment and maintaining proper NOx reduction. Customers searching for a Cummins QSK SCR outlet catalyst, QSK SCR catalyst module, diesel SCR catalyst replacement, Cummins aftertreatment catalyst, or OEM 4354188 can find this application-specific component at TamerX Diesel Parts for compatible 2018-2024 applications.
Diagnosing a faulty SCR Outlet Catalyst Module involves checking exhaust emissions data, diagnostic trouble codes, and the overall condition of the diesel aftertreatment system. Since the Selective Catalytic Reduction (SCR) system uses Diesel Exhaust Fluid (DEF) and a catalyst to reduce nitrogen oxide (NOx) emissions, identifying the actual cause of poor SCR performance is essential before replacing the module.
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Check diagnostic trouble codes: Use a compatible diagnostic scanner to identify SCR efficiency faults, NOx sensor codes, and other aftertreatment-related warnings.
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Monitor NOx sensor readings: Compare upstream and downstream NOx measurements under appropriate operating conditions to evaluate the SCR system's NOx reduction performance.
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Inspect DEF quality and delivery: Check DEF concentration, contamination, dosing operation, and injector condition to identify problems that may reduce SCR efficiency.
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Examine exhaust temperature readings: Verify that exhaust temperature sensors are functioning correctly and that operating temperatures meet the manufacturer's requirements for effective SCR operation.
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Inspect for exhaust leaks: Examine exhaust connections, gaskets, and surrounding components for leaks that could interfere with emissions measurements or aftertreatment performance.
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Check for catalyst damage or restrictions: Inspect the SCR Outlet Catalyst Module for physical damage, excessive deposits, or internal restrictions that may affect exhaust flow and catalyst effectiveness.
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Evaluate related sensors and wiring: Examine NOx sensors, temperature sensors, electrical connectors, and wiring harnesses for faults that could produce misleading diagnostic readings.
Diagnosing an SCR Outlet Catalyst Module requires evaluating the entire aftertreatment system rather than relying on a single fault code. Following manufacturer diagnostic procedures, verifying sensor data, and checking DEF delivery and catalyst condition can help determine whether the module is defective or another component is responsible for the problem.
Yes. Gradual catalyst deterioration may reduce NOx conversion efficiency before the engine control system identifies a condition that exceeds its diagnostic limits. Regular aftertreatment monitoring can help detect declining performance before more serious emissions problems develop.
Uneven deterioration can result from inconsistent exhaust temperatures, irregular ammonia distribution, localized contamination, or variations in exhaust flow. These conditions may cause certain catalyst areas to lose effectiveness faster than others.
Sulfur compounds can interfere with catalytic reactions and contribute to deposits on active surfaces. Prolonged exposure to unsuitable fuel or excessive sulfur contamination may reduce the module's NOx conversion efficiency.
Exhaust residence time refers to how long exhaust gases remain in contact with the catalyst. Adequate contact time supports NOx reduction, while unusually high exhaust flow rates may reduce conversion efficiency under certain operating conditions.



























