
Cummins QSB 4.5L SCR Outlet Catalyst Module 2014-2021: OEM 4353545
CUMMINS QSB 4.5L SCR OUTLET CATALYST MODULE 2014-2021: OEM 4353545

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 4353545RM-SCR ( OEM Part Number 4353545 ). 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 QSB 4.5L, production years 2014-2021, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
OEM NUMBERS
| Primary OEM | 4353545 |
| Additional OEM | 4353545 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490557000 |
| WEIGHT | 55.00 LBS |
SHIPPING OPTIONS
Ship Weight : 55.00 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.
Power your aftertreatment system with confidence using the Cummins QSB 4.5L SCR Outlet Catalyst Module 2014–2021 (OEM 4353545). Designed specifically for Cummins QSB 4.5L engines, this SCR outlet catalyst module helps reduce NOx emissions while supporting efficient exhaust treatment and dependable emissions system operation. Manufactured to OEM specifications, it provides precise fitment and reliable compatibility across the listed model years. Installing the correct SCR outlet catalyst module helps maintain proper exhaust flow, consistent emissions compliance, and long-lasting system reliability.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2014 | Cummins | QSB 4.5L | ||||
| 2015 | Cummins | QSB 4.5L | ||||
| 2016 | Cummins | QSB 4.5L | ||||
| 2017 | Cummins | QSB 4.5L | ||||
| 2018 | Cummins | QSB 4.5L | ||||
| 2019 | Cummins | QSB 4.5L | ||||
| 2020 | Cummins | QSB 4.5L | ||||
| 2021 | Cummins | QSB 4.5L | ||||
PEOPLE ALSO ASKS | BLOG(S)
The Cummins QSB 4.5L SCR Outlet Catalyst Module 2014-2021 OEM 4353545 is an important part of the diesel aftertreatment system, helping complete the exhaust gas treatment process before emissions leave the exhaust. One of the most searched topics related to SCR outlet catalyst modules is how they contribute to proper exhaust gas treatment. Installing the correct OEM replacement helps maintain factory compatibility and supports reliable operation of the emissions system.
- OEM 4353545 is designed for 2014-2021 Cummins QSB 4.5L engine applications, providing OEM-quality fit and dependable compatibility.
- Supports the final stage of the Selective Catalytic Reduction (SCR) system, helping complete the treatment of exhaust gases.
- Designed to work with factory aftertreatment components, maintaining the original exhaust system configuration.
- Constructed with high-quality catalyst materials engineered to withstand continuous exposure to elevated exhaust temperatures.
- Promotes consistent exhaust gas movement through the aftertreatment system, supporting reliable emissions control.
- Direct-fit design matches original mounting points and exhaust connections, helping simplify installation on compatible applications.
- Built for long-lasting durability, making it a dependable replacement for restoring proper SCR outlet catalyst function.
The Cummins QSB 4.5L SCR Outlet Catalyst Module 2014-2021 OEM 4353545 is a reliable solution for maintaining the final stage of your diesel aftertreatment system. With OEM-quality construction, precise fitment, and durable catalyst technology, it helps support effective exhaust gas treatment and dependable emissions system operation for compatible Cummins QSB 4.5L applications.
The SCR Outlet Catalyst Module is a critical part of the Selective Catalytic Reduction (SCR) system, helping ensure nitrogen oxide (NOx) emissions are properly reduced before exhaust gases exit the vehicle. When this component begins to fail, it can reduce the efficiency of the aftertreatment system and lead to warning lights, reduced engine performance, and emissions-related problems. Recognizing the symptoms early can help prevent more extensive repairs.
- The check engine light or SCR warning light may illuminate due to reduced catalyst efficiency or SCR-related faults.
- Engine derate or reduced power mode can occur if the engine control module detects that emissions requirements are not being met.
- Recurring diagnostic trouble codes related to SCR efficiency, NOx sensors, or catalyst performance may indicate a failing module.
- Increased Diesel Exhaust Fluid (DEF) consumption can occur as the SCR system attempts to compensate for reduced catalyst effectiveness.
- Failed emissions inspections may result from elevated NOx emissions caused by poor SCR performance.
- Reduced fuel efficiency or sluggish engine response may develop as the engine adjusts to emissions system faults.
- Continued operation with a failing SCR Outlet Catalyst Module can place additional strain on related components, including NOx sensors, DEF injectors, and the SCR catalyst.
Diagnosing SCR Outlet Catalyst Module problems promptly helps restore proper emissions system operation and prevents unnecessary damage to other aftertreatment components. Timely maintenance and repairs support reliable engine performance, maintain emissions compliance, and reduce the risk of costly downtime.
Yes, contamination from excessive soot, oil, or coolant can reduce catalyst efficiency. Correcting engine problems helps prevent premature catalyst damage.
The DEF injector, NOx sensors, DEF pump, temperature sensors, exhaust piping, and electrical connectors should all be inspected. Ensuring these parts are functioning properly supports reliable SCR operation.
Yes, worn or broken exhaust hangers can allow excessive movement that places stress on the catalyst housing. Replacing damaged supports helps prevent unnecessary vibration.
Regular maintenance helps keep DEF flowing properly and prevents contamination within the SCR system. This supports consistent catalyst performance and longer service life.




























