
Cummins B6.7, L9 DOC 2018-2022
CUMMINS B6.7, L9 DOC 2018-2022

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a New, Skyline Emissions DOC, Skyline Emissions part number BJ0301-C.This part is primarily made for a Cummins B6.7, L9, production years 2018-2022, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
Additional Notes: 1x of CL068, 1x of CL045,1x of GA068, 1x of GA045
OEM NUMBERS
| Additional OEM | 2112657XS, 4394820, 4394820NX, 4394820RX, A055N107 |
ADDITIONAL DETAILS
| CONDITION | New |
| UPC / Barcode | 00840490542662 |
| WEIGHT | 42.35 LBS |
SHIPPING OPTIONS
Ship Weight : 42.35 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.
Serving Cummins B6.7 and L9 engine platforms from 2018–2022, this Diesel Oxidation Catalyst (DOC) is engineered to meet original equipment specifications for accurate fit and dependable aftertreatment system operation. The DOC plays a vital role in the exhaust process by converting hydrocarbons and carbon monoxide into less harmful emissions before they continue downstream. Manufactured with robust catalyst materials and a heavy-duty housing, it is designed to endure elevated exhaust temperatures and demanding duty cycles. Proper function of this DOC helps support emissions compliance and overall exhaust system efficiency. Tamerx Diesel Products LLC offers this Cummins B6.7 and L9 DOC as a reliable solution for consistent aftertreatment performance.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2018 | Cummins | B6.7 | L9 | |||
| 2019 | Cummins | B6.7 | L9 | |||
| 2020 | Cummins | B6.7 | L9 | |||
| 2021 | Cummins | B6.7 | L9 | |||
| 2022 | Cummins | B6.7 | L9 | |||
PEOPLE ALSO ASKS | BLOG(S)
The Diesel Oxidation Catalyst (DOC) plays a key role in reducing harmful exhaust gases before they exit your vehicle. Although it’s built to handle high temperatures, it does not last forever. Replacement is typically based on condition rather than mileage.
There is no set service interval for a DOC. Instead, it should be replaced when diagnostics confirm it is no longer functioning properly.
Common signs it may be time to replace your DOC include:
- Persistent catalyst efficiency fault codes
- Failed emissions testing
- Ongoing check engine or aftertreatment warning light
- Excessive exhaust restriction
- Internal rattling noises from the exhaust housing
- Evidence of melted or cracked internal substrate
If contamination from oil or coolant is present, cleaning may be possible in minor cases. However, if the internal catalyst structure is damaged, replacement is usually the only reliable option.
Proper diagnosis is essential. A technician will review temperature data before and after the DOC, check pressure readings, and scan for related fault codes to confirm the failure.
Replacing a failing DOC promptly helps protect other exhaust system components and ensures the emissions system continues operating as intended.
Yes, the DOC is configured with connections for original exhaust sensor interfaces.
Yes, a functioning DOC contributes to meeting prescribed emissions control requirements.
The DOC conditions exhaust gases ahead of the particulate filter and SCR systems for effective downstream treatment.
Yes, proper fitment ensures alignment with the engine’s exhaust geometry and sensor locations.




















































