
Cummins B6.7, L9 DOC Filter 2022-2024: OEM 4394859
CUMMINS B6.7, L9 DOC FILTER 2022-2024: OEM 4394859

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 102-0154RM-DOC ( OEM Part Number 4394859 ). 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 | 4394859 |
| Additional OEM | 4394859 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490549593 |
| 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.
Designed for 2022–2024 Cummins B6.7 and L9 engines, the OEM 4394859 DOC Filter is built to support proper exhaust aftertreatment operation and emissions compliance. This Diesel Oxidation Catalyst (DOC) is responsible for converting harmful exhaust gases into less harmful compounds before they move through the remaining aftertreatment components. Manufactured to meet original equipment specifications, it provides accurate fitment and seamless integration with factory-installed sensors and hardware. Its robust construction is engineered to handle high exhaust temperatures and demanding duty cycles common in medium- and heavy-duty applications. Ideal for fleets and independent operators seeking a direct OEM replacement, this Cummins B6.7 and L9 DOC Filter helps maintain emissions system reliability and reduce unnecessary downtime. Rely on Tamerx Diesel Products LLC for dependable diesel aftertreatment components that meet strict manufacturer standards.
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 Filter 2022–2024: OEM 4394859 refers to the Diesel Oxidation Catalyst (DOC) / inlet catalyst module used on Cummins B6.7 and L9 engines to treat exhaust emissions. It’s a key part of the aftertreatment system that works before the diesel particulate filter (DPF) and selective catalytic reduction (SCR) components.
Key Components of the DOC Filter (OEM 4394859)
While Cummins does not publish a full internal parts breakdown, the main structural and functional components typically include:
Core Catalyst Elements
- Ceramic or metallic catalyst substrate — the internal honeycomb structure that provides extensive surface area for chemical reactions.
- Precious metal washcoat (typically platinum and/or palladium) applied to the substrate to initiate the oxidation of hydrocarbons and carbon monoxide in the exhaust gases.
Housing & Mounting
- Outer stainless steel shell
- a durable canister that protects internal catalyst elements and withstands exhaust heat and vibration.
- Flanges or connection interfaces
- for secure integration into the exhaust/aftertreatment piping.
- Heat shields or insulation (in some designs)
- to manage thermal conditions and protect adjacent components.
Sealing & Connection Accessories
- Gaskets and clamps
- installed at inlet and outlet connections to ensure a tight seal and prevent leaks. These may be included in complete kits sold with the DOC unit.
Sensor Ports
- Provision for oxygen or temperature sensors (depending on system configuration) that feed data to the engine control module (ECM) to help manage aftertreatment functions.
Together, these components support proper conversion of pollutants before further treatment downstream, helping the engine’s emissions system operate as designed.
Extending the lifespan of your DOC (Diesel Oxidation Catalyst) filter starts with consistent maintenance and smart operating habits. Because the DOC plays a critical role in managing exhaust emissions, keeping it clean and functioning properly helps prevent premature failure.
Several practical steps can help protect your DOC filter:
- Use high-quality diesel fuel to minimize harmful deposits
- Address injector issues quickly to prevent unburned fuel buildup
- Fix oil or coolant leaks that may contaminate the exhaust system
- Avoid excessive idling that limits proper exhaust temperature
- Follow manufacturer-recommended service intervals
- Respond promptly to dashboard warning lights
Driving conditions also matter. Short trips that don’t allow the engine to reach full operating temperature can contribute to soot accumulation. Whenever possible, ensure the vehicle operates long enough for the exhaust system to reach appropriate heat levels.
Routine inspections are equally important. Checking for clogged components, damaged sensors, or exhaust leaks can prevent small concerns from escalating into major repairs.
By staying proactive and maintaining the overall health of your engine and exhaust system, you can help your DOC filter last longer and reduce the likelihood of costly downtime.
This DOC filter helps clean exhaust emissions by converting harmful gases before they exit the exhaust system.
It installs in the aftertreatment section of the exhaust system, downstream of the turbocharger.
The DOC filter works to reduce pollutants in the exhaust stream to meet emissions requirements.
Yes, OEM 4394859 is intended to replace worn or failed DOC filters with the correct specification.














