
International Navistar A26 DPF Filter 2021-2024: OEM 2521227C1
INTERNATIONAL NAVISTAR A26 DPF FILTER 2021-2024: OEM 2521227C1

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Remanufactured Tamerx DPF Filter, Tamerx part number 2521227RM-DOC ( OEM Part Number 2521227C1 ). 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 International Navistar A26, production years 2021-2024, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
OEM NUMBERS
| Primary OEM | 2521227C1 |
| Additional OEM | 2521227C1, 2583180X |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490552449 |
| WEIGHT | 33.00 LBS |
SHIPPING OPTIONS
Ship Weight : 33.00 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 to meet emissions system requirements on 2021–2024 International Navistar A26 applications, the DPF Filter (OEM 2521227C1) is a key part of the diesel exhaust aftertreatment system. This diesel particulate filter is engineered to align with factory exhaust layouts and emissions sensor locations specific to the A26 engine. Its function is to capture and store soot from exhaust gases, helping reduce particulate emissions and support compliance with applicable emissions standards. Proper DPF operation supports consistent exhaust flow and can help limit issues such as warning lights, fault codes, or derate conditions. This page provides application-focused information to assist with accurate identification of the International Navistar A26 DPF Filter OEM 2521227C1 for service and replacement needs.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2021 | International Navistar | A26 | ||||
| 2022 | International Navistar | A26 | ||||
| 2023 | International Navistar | A26 | ||||
| 2024 | International Navistar | A26 | ||||
PEOPLE ALSO ASKS | BLOG(S)
The International/Navistar A26 DPF Filter, OEM 2521227C1, is an essential component of the aftertreatment emissions system used on 2021–2024 International trucks equipped with the A26 engine. Its primary function is to capture and remove diesel particulate matter (soot) from the engine’s exhaust before gases are released into the atmosphere.
A DPF (Diesel Particulate Filter) is not a fuel filter or an air filter—it’s specifically designed to trap and store solid particles that form during diesel combustion. As exhaust flows through the filter’s ceramic honeycomb substrate, soot and fine particulates are physically captured within its internal channels. This process helps reduce visible smoke and tightens control over emissions that would otherwise contribute to air pollution.
Once the filter begins to collect soot, the engine’s system initiates regeneration, a controlled cleaning cycle that raises exhaust temperature to burn off stored soot. This converts the accumulated particulate matter into a small amount of ash, which remains in the filter until service is needed. Without regeneration, the filter would eventually become clogged, creating backpressure, performance issues, and emissions faults.
In short, the A26 DPF Filter (OEM 2521227C1) functions to:
- Trap and retain soot from the exhaust stream
- Reduce particulate emissions and visible smoke
- Support emissions compliance for 2021–2024 A26 engines
- Enable regeneration cycles that clean the filter
- Maintain stable exhaust flow and system performance
This role makes the DPF filter vital for meeting regulatory requirements and ensuring long-term reliability of the aftertreatment system.
No, a DPF filter should not be reused after professional servicing, and replacement is strongly recommended.
When a DPF (Diesel Particulate Filter) reaches the point where professional servicing is needed, it has usually already experienced heavy soot loading, extreme heat exposure, or permanent ash saturation. While servicing may temporarily reduce restriction, it does not restore the filter’s internal structure or original soot-holding capacity.
Why reusing a serviced DPF filter is not recommended
- Recurring warning lights and fault codes
- The underlying limitation of the filter remains, so issues return quickly.
- Incomplete or repeated regeneration cycles
- A compromised DPF struggles to regenerate properly.
- Continued exhaust restriction
- Residual ash and internal wear still restrict exhaust flow.
- Increased stress on other emissions components
- A weakened DPF can accelerate damage to the DOC, sensors, and turbo.
- Short and unpredictable remaining lifespan
- Even if it works briefly, failure often returns much sooner than expected.
Professional servicing cannot repair internal cracking, heat damage, or long-term ash buildup. For reliable operation and emissions compliance, DPF replacement—not reuse—is the correct solution.
Regular inspection of sensors and proper regeneration practices help maintain DPF condition.
Using the correct OEM part ensures proper fit, function, and compatibility with the engine’s aftertreatment system.
OEM 2521227C1 is a diesel particulate filter designed for International/Navistar A26 engines from 2021 to 2024 that traps soot and particulate matter in the exhaust.
Yes, a restricted DPF filter can trigger aftertreatment warning indicators and diagnostic codes.




