
Cummins ISG12, QSG12 DOC Filter 2011-2020: OEM 4353999
CUMMINS ISG12, QSG12 DOC FILTER 2011-2020: OEM 4353999

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Remanufactured Tamerx DOC Filter, Tamerx part number 102-0232RM-DOC ( OEM Part Number 4353999 ). 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 ISG12, QSG12, production years 2011-2020, and comes with a One Million Miles or One Year Warranty.
OEM NUMBERS
| Primary OEM | 4353999 |
| Additional OEM | 4329514, 4353999 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490558281 |
| WEIGHT | 35.00 LBS |
SHIPPING OPTIONS
Ship Weight : 35.00 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.
Improve exhaust treatment with this Cummins ISG12, QSG12 DOC Filter for 2011–2020 applications. OEM 4353999 helps oxidize harmful exhaust pollutants, supporting proper emissions control and aftertreatment system operation. A dependable replacement for damaged, contaminated, or failing DOC filters in compatible Cummins ISG12 and QSG12 engines.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2011 | Cummins | ISG12 | QSG12 | |||
| 2012 | Cummins | ISG12 | QSG12 | |||
| 2013 | Cummins | ISG12 | QSG12 | |||
| 2014 | Cummins | ISG12 | QSG12 | |||
| 2015 | Cummins | ISG12 | QSG12 | |||
| 2016 | Cummins | ISG12 | QSG12 | |||
| 2017 | Cummins | ISG12 | QSG12 | |||
| 2018 | Cummins | ISG12 | QSG12 | |||
| 2019 | Cummins | ISG12 | QSG12 | |||
| 2020 | Cummins | ISG12 | QSG12 | |||
PEOPLE ALSO ASKS | BLOG(S)
A diesel oxidation catalyst must maintain clear exhaust passages and active catalyst surfaces to function properly within the aftertreatment system. The Cummins ISG12, QSG12 DOC Filter 2011-2020: OEM 4353999 helps process exhaust gases through oxidation reactions, making the condition of its internal structure important for consistent emissions treatment.
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OEM 4353999 is intended for compatible 2011-2020 Cummins ISG12 and QSG12 diesel applications.
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Diesel Oxidation Catalyst (DOC) technology helps convert carbon monoxide and unburned hydrocarbons into less harmful exhaust compounds.
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Catalyst-coated internal surfaces provide the active reaction area needed for oxidation during exhaust treatment.
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Open exhaust channels allow gases to travel through the catalyst while maintaining contact with its reactive surfaces.
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Resistance to exhaust heat allows the catalyst structure to withstand elevated temperatures during normal aftertreatment operation.
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Protective outer housing helps safeguard the internal substrate against vibration and physical damage.
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Proper catalyst condition helps prevent treatment issues associated with contaminated, deteriorated, or damaged catalyst surfaces.
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Application-specific dimensions and connections help maintain correct positioning within compatible Cummins ISG12 and QSG12 exhaust assemblies.
The Cummins ISG12, QSG12 DOC Filter OEM 4353999 provides an essential oxidation stage for treating diesel exhaust before it reaches downstream aftertreatment components. Customers searching for a Cummins ISG12 DOC filter, Cummins QSG12 diesel oxidation catalyst, DOC catalyst replacement, diesel exhaust oxidation filter, or OEM 4353999 can find this application-specific component at TamerX Diesel Parts for compatible 2011-2020 applications.
Oil contamination can reduce the effectiveness of a Diesel Oxidation Catalyst (DOC) Filter by allowing oil residue and combustion byproducts to accumulate on its internal catalyst surfaces. Since the DOC helps oxidize harmful exhaust gases and supports Diesel Particulate Filter (DPF) regeneration, excessive oil contamination can interfere with catalyst activity and affect overall aftertreatment operation.
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Catalyst surface contamination: Oil-derived deposits can coat the DOC's active surfaces, reducing their ability to process exhaust pollutants effectively.
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Reduced oxidation efficiency: Contaminated catalyst material may become less effective at converting carbon monoxide and unburned hydrocarbons.
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DPF regeneration problems: Reduced DOC activity can limit heat generation needed to support proper DPF regeneration.
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Increased exhaust restriction: Heavy deposits may restrict exhaust flow through the DOC Filter and contribute to higher backpressure.
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Excessive engine oil consumption: Worn piston rings, valve seals, or turbocharger problems can allow oil to enter the exhaust system and contaminate the DOC.
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Aftertreatment fault codes: Abnormal exhaust temperatures, regeneration problems, or catalyst-related issues may trigger diagnostic trouble codes.
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Permanent catalyst damage: Severe oil contamination can leave deposits that professional cleaning may not fully remove, potentially requiring DOC replacement.
Oil contamination can shorten the service life of a DOC Filter and reduce its ability to support normal emissions system operation. Identifying the source of oil entering the exhaust, inspecting the catalyst, and checking related aftertreatment components can help prevent recurring contamination and determine whether cleaning or replacement is necessary.
The DOC Filter helps reduce harmful exhaust pollutants by converting carbon monoxide and unburned hydrocarbons into less harmful compounds through catalytic oxidation. It also supports downstream exhaust aftertreatment components by promoting chemical reactions within the exhaust stream.
Yes. If the DOC becomes severely restricted, increased exhaust backpressure can interfere with normal engine operation and contribute to sluggish acceleration. However, fuel delivery, turbocharger, and other exhaust system problems can produce similar symptoms.
Possible signs include unusual exhaust noises, increased backpressure, reduced catalyst efficiency, and recurring aftertreatment warnings. A professional inspection can help identify cracked, displaced, or deteriorated internal catalyst material.
The DOC uses oxygen in the exhaust stream to support oxidation reactions that reduce carbon monoxide and unburned hydrocarbons. Insufficient oxygen availability can limit these reactions under certain operating conditions.















