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Cummins QSB, 4.5L, ISB DOC 2011-2020: OEM 4353547

CUMMINS QSB, 4.5L, ISB DOC 2011-2020: OEM 4353547

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$4,995.00

CORE CHARGE:

$500.00
iCORE DISCLAIMER: The CORE charge is a 30 day hold and will not be processed as long as the CORE is returned within 30 days. If you do not have a CORE or fail to return the CORE within 30 days, the CORE charge hold amount will be processed at that time.

AVAILABILITY IN STOCK
OEM NUMBER4353547
PART TYPEDOC
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEQSB, 4.5L, ISB
YEAR2011-2020
PART NUMBER4353547RM-DOC
APPLICATION NOTESTier 4
WARRANTY
One Million Miles or One Year

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx DOC, Tamerx part number 4353547RM-DOC ( OEM Part Number 4353547 ). 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, ISB, production years 2011-2020, and comes with a One Million Miles or One Year Warranty.

OEM NUMBERS

Primary OEM4353547
Additional OEM4353547, A048H228

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490556027
WEIGHT45.00 LBS

SHIPPING OPTIONS

Ship Weight : 45.00 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.


Designed to help your emissions system perform with confidence, the Cummins QSB, 4.5L, ISB DOC 2011–2020 (OEM 4353547) is an essential part of the diesel aftertreatment process. Engineered for Cummins QSB, 4.5L, and ISB engines, this diesel oxidation catalyst helps reduce harmful exhaust emissions before they reach downstream components. Manufactured to meet OEM specifications, it delivers precise fitment and dependable compatibility for the listed model years. Installing the correct DOC helps support efficient exhaust treatment and reliable long-term system operation.

FITMENT CHART

YEARMAKEENGINE(S)
2011Cummins QSB 4.5L ISB
2012Cummins QSB 4.5L ISB
2013Cummins QSB 4.5L ISB
2014Cummins QSB 4.5L ISB
2015Cummins QSB 4.5L ISB
2016Cummins QSB 4.5L ISB
2017Cummins QSB 4.5L ISB
2018Cummins QSB 4.5L ISB
2019Cummins QSB 4.5L ISB
2020Cummins QSB 4.5L ISB

PEOPLE ALSO ASKS | BLOG(S)

The Cummins QSB, 4.5L, ISB DOC 2011-2020: OEM 4353547 is an essential part of the diesel exhaust aftertreatment system, designed to process exhaust gases before they move through the remaining emissions components. Built to OEM standards, this diesel oxidation catalyst offers dependable compatibility for Cummins QSB 4.5L and ISB engine applications.

  • OEM 4353547 fits Cummins QSB 4.5L and ISB engines from 2011-2020
  • Designed to serve as the diesel oxidation catalyst (DOC) in the exhaust system
  • Supports proper exhaust gas treatment within the aftertreatment assembly
  • Precision-built for OEM fit, alignment, and installation
  • Constructed with durable materials for reliable long-term service
  • Ideal replacement for worn or damaged factory DOC units

The Cummins QSB, 4.5L, ISB DOC OEM 4353547 is a dependable replacement component for restoring the integrity of your diesel aftertreatment system. Tamerx Diesel Parts provides high-quality OEM-fit emissions components trusted by diesel truck owners and repair professionals.

 

Excessive soot can have a significant impact on the performance and lifespan of a Diesel Oxidation Catalyst (DOC). The DOC is designed to oxidize harmful exhaust gases before they reach the Diesel Particulate Filter (DPF). When too much soot enters the system, it can restrict airflow and reduce the catalyst's ability to function efficiently.

  • Heavy soot buildup can block the surface of the catalyst, limiting the chemical reactions needed to treat exhaust gases.
  • Restricted exhaust flow may increase backpressure, reducing engine performance and efficiency.
  • Excessive soot can interfere with proper DPF regeneration by reducing the heat generated through the DOC.
  • Faulty fuel injectors, incomplete combustion, or excessive idling can increase soot production and accelerate DOC contamination.
  • Persistent soot accumulation may trigger check engine lights or catalyst efficiency fault codes.
  • Over time, excessive buildup can contribute to overheating or permanent damage to the catalyst substrate.
  • A clogged DOC can place additional stress on downstream emissions components, including the DPF and SCR system.

Preventing excessive soot buildup starts with maintaining proper engine performance and addressing combustion issues early. Regular inspections and timely repairs help protect the DOC, improve aftertreatment efficiency, and extend the life of the entire emissions system.

 
 

Yes, prolonged exposure to excessive exhaust temperatures can reduce catalyst effectiveness. Proper engine maintenance helps minimize overheating issues.

A restricted DOC can reduce exhaust flow and increase backpressure. This may trigger fault codes and reduce engine performance.

Yes, faulty injectors can produce excessive soot that places additional stress on the DOC. Repairing fuel system issues early can help extend its service life.

Technicians inspect the DOC for physical damage, restrictions, and contamination. They also review diagnostic fault codes and aftertreatment data.

Cummins DOCs

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