
Cummins B6.7, L9 DOC Filter 2022-2024: OEM 4394676
CUMMINS B6.7, L9 DOC FILTER 2022-2024: OEM 4394676

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 102-0097RM-DOC-10 ( OEM Part Number 4394676 ). 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 B6.7, L9, production years 2022-2024, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
Additional Notes: Inlet Catalyst
OEM NUMBERS
| Primary OEM | 4394676 |
| Additional OEM | 4394676 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490549524 |
| 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 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.
Supporting emissions control on select late-model Cummins engines, the Cummins B6.7 and L9 DOC Filter 2022–2024, OEM Part Number 4394676, is engineered to help convert harmful exhaust gases into less harmful emissions before they flow through the rest of the aftertreatment system. Built to meet OEM fitment standards, it offers durable construction and precise integration for demanding commercial and vocational applications. When a DOC filter becomes restricted or reaches the end of its service life, it can trigger warning indicators, increased exhaust backpressure, or other aftertreatment system concerns that require attention. Timely replacement helps maintain consistent emissions system operation and supports overall engine function. Tamerx Diesel Products LLC provides trusted diesel components designed to help keep your Cummins engines operating cleanly and reliably.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2022 | Cummins | B6.7 | L9 | |||
| 2023 | Cummins | B6.7 | L9 | |||
| 2024 | Cummins | B6.7 | L9 | |||
PEOPLE ALSO ASKS | BLOG(S)
The Cummins B6.7, L9 DOC (Diesel Oxidation Catalyst) Filter OEM 4394676 is a factory-specified emissions aftertreatment component used on 2022–2024 Cummins B6.7 and L9 diesel engines. It is an early stage in the exhaust treatment system that helps reduce certain harmful exhaust gases before they move on to downstream devices such as the Diesel Particulate Filter (DPF) and Selective Catalytic Reduction (SCR) systems.
Although it’s often called a “filter,” the DOC doesn’t trap soot. Instead, it uses a catalyst-coated internal substrate to chemically convert exhaust pollutants as hot exhaust gases pass through it.
The Cummins DOC Filter OEM 4394676 is designed to:
- Convert carbon monoxide (CO) into carbon dioxide (CO₂)
- Oxidize unburned hydrocarbons (HC) into water vapor and CO₂
- Help raise exhaust temperature to support downstream regeneration processes
- Reduce exhaust odor and harmful gases
- Support overall emissions compliance
Inside the DOC is a honeycomb-like core coated with catalytic materials (often precious metals). As exhaust gases pass through this core, chemical reactions occur that transform specific pollutants into less harmful substances.
One important function of the DOC is heat generation through oxidation. This helps raise exhaust temperatures to levels that support the regeneration of the Diesel Particulate Filter—the process that burns off accumulated soot.
The OEM 4394676 DOC Filter is engineered specifically for Cummins B6.7 and L9 platforms, ensuring proper fitment and integration with factory aftertreatment systems and sensors.
In summary, the Cummins B6.7, L9 DOC Filter OEM 4394676 helps reduce harmful emissions and supports efficient operation of the full aftertreatment system on 2022–2024 engines.
The DOC (Diesel Oxidation Catalyst) filter reduces harmful exhaust gases before they move through the rest of the aftertreatment system. Because it operates under high heat and depends on clean exhaust flow, proper engine care is essential to extend its lifespan.
Preventing contamination is the most important factor.
To help prolong the lifespan of your DOC filter:
- Repair oil or coolant leaks immediately
- Address engine misfires promptly
- Maintain fuel injectors and the EGR system
- Use the correct engine oil specified by the manufacturer
- Avoid excessive idling
- Fix exhaust leaks as soon as they are detected
Oil or coolant entering the exhaust stream can coat the catalyst surface and reduce its effectiveness. Over time, this contamination can permanently damage the internal substrate.
Excess soot from engine issues can also raise exhaust temperatures and stress the catalyst structure.
Routine diagnostic scans and responding quickly to warning lights can prevent small issues from escalating into major failures.
By maintaining proper engine operation and correcting problems early, you can significantly extend the service life of your DOC filter and protect your entire aftertreatment system.
Yes — professional installation ensures proper sealing, sensor connections, and integration with the exhaust system.
Using the correct OEM 4394676 helps maintain reliable oxidation of exhaust gases and supports consistent emissions aftertreatment operation.
This DOC Filter is installed in the exhaust aftertreatment assembly, typically upstream of the diesel particulate filter (DPF).
It helps reduce harmful exhaust gases by beginning the oxidation process before other aftertreatment components.









