Product Overview
Aftermarket DOC Replacement for Cummins / PACCAR A055B959 / 5579371 / 4394579 / 2064075 DPF
Interchangeable Component Configurations: A055B959 | 5579371 | 4394579 | 2064075 | XQ0461
Restore emissions performance with this premium Skyline aftermarket Cummins / PACCAR A055B959 / 5579371 / 4394579 / 2064075 DPF Replacement Kit. This brand-new unit serves as a direct-fit alternative to high-traffic OEM part numbers A055B959, 5579371, 4394579, 2064075, A064B961, 5579371RX, 5579371NX, 4394579NX, 4394579RX, 2064075XS, and 2064075X. Engineered as an exact-fit replacement for medium-duty systems running Cummins B6.7, Cummins L9 8.9L, PACCAR PX-7, and PACCAR PX-9 engine platforms, this high-efficiency diesel particulate filter requires no exhaust system modifications for installation, carries zero core charge, and ships free within the continental United States.
Cummins / PACCAR A055B959 Cross Reference
How to Verify Your Unit: This direct-fit replacement diesel oxidation catalyst replaces components stamped with housing part numbers, casting tags, or serial plates matching any of the interchangeable manufacturing references listed below:
| Manufacturer | Cross Reference Part Numbers |
|---|---|
| PACCAR | 2131526, 2131526PE, 2131526PEX, 2088094XS, 2088094X, 2088094, 2088093X, 2088093XS, 2088093, A055H477, 2131536, 2131536PE, 2131536PEX |
| Skyline | XQ0461, XQ0461-M, XQ0461-C |
| Roadwarrior | C0318-ID |
| Dinex | 58070 |
| DuraFit | C20-0133 |
| GESi | GESi-569 |
Choose Your Kit Configuration
Select the setup from the product options above that best fits your shop's needs:
- Full Kit (Best Value): Includes (1) Brand-New Unit, (1) 5304868 and (1) 2880215 OEM-quality flange gaskets, and (1) 5304849 and (1) 2880213 heavy-duty hardware alignment clamps.
- DOC Only: Includes the replacement catalyst component only. Installation gaskets and clamps are not included.
Technical Specifications
| Material | Premium Stainless Steel |
| Weight | 48.28 lbs (23.35 kg) |
| Length | 15.13 inches (543.10 mm) |
| Width Dimension | 15.13 inches (421.00 mm) |
| Height Dimension | 9.33 inches (192.30 mm) |
| Exhaust Emission Norm | EPA21 Compliance Certified Matrix |
| Country of Origin | Latvia (LV) |
Key Features & Specifications for Part 2131526 / 2088094 / A055H477
- Built in the USA: Designed, engineered, and manufactured in America.
- No Core Charge: Brand-new aftermarket diesel oxidation catalyst; completely eliminates core return freight fees and paperwork delays.
- Exact-Fit™ Technical Dimensions: Engineered with OEM-matching physical sizing, pre-machined sensor bosses, and rigid factory-spec indexing alignments for direct installation with zero modifications required.
- Catalyst Substrate Matrix: High-performance flow-through washcoat substrate provides proper upstream heat generation to effectively support downstream DPF regeneration cycles.
- Industry-Leading Warranty: Backed by a 3-year unlimited mileage warranty on all Skyline aftermarket solutions.
- EPA Compliant: Meets federal emissions standards for legal installation nationwide.
- Free Shipping: Free ground shipping within the continental United States. Orders placed before 2:00 PM Eastern ship out the same business day.
PACCAR MX-13 Vehicle Fitment Guide
Direct alternative solution for commercial heavy-duty vehicles configured with compatible aftertreatment layouts from approximately 2017 to present chassis layouts. Optimized for:
- Engine Platforms: PACCAR MX-13 / MX13 engines operating on EPA13 and EPA21 medium-to-heavy aftertreatment platforms.
- Chassis Fitments: This specific high-traffic physical layout matches factory attachments across line-haul, regional haul, and vocational configurations:
- Kenworth Platforms: Models T660, T880, and W900 setups tracking under indexing codes 2131526 and 2088094.
- Peterbilt Platforms: Models 389, 567, and 579 configurations tracking under database references A055H477 and 2088093.
Compatible OEM Master Assembly Numbers: 2131536, 2131536PE, 2131536PEX
Signs Your Diesel Oxidation Catalyst (DOC) Needs Replacement
- Inability to initiate or sustain passive or active DPF regeneration cycles due to low catalytic temperatures across numbers 2131526 / 2088094
- Visual signs of face-plugging, oil contamination, or unburned fuel soot accumulation at the internal element face
- Active dashboard diagnostic trouble codes (DTCs) signaling low catalyst efficiency levels or engine backpressure spikes
- Unexplained increase in downstream DPF loading frequency due to loss of upstream catalytic conversion efficiency
Frequently Asked Questions
Is there a core charge for this aftermarket emissions unit?
No, this is a 100% brand-new aftermarket component. Unlike remanufactured factory units, there is absolutely zero core charge, zero tracking paperwork required, and no need to spend money shipping your old, dirty unit back to us.
Does this replacement unit come with the necessary clamps and gaskets?
When you select the "Full Kit" option from the dropdown on this page, all exact-fit installation gaskets and heavy-duty alignment clamps required for installation are bundled and shipped directly with the assembly. Selecting the component-only option provides the bare unit without hardware.
How fast will my order ship out?
Orders confirmed before 2:00 PM Eastern standard time ship out from our closest regional fulfillment hub on the exact same business day. Free standard ground shipping is included to the continental United States, and expedited overnight air choices can be selected directly at checkout.
How do I verify this aftermarket filter matches my truck's setup?
You can verify fitment by identifying the original casting, housing, or tag stamp directly on your factory exhaust unit canister shell. If that number matches any of the cross-references listed on this page, or if your engine model and year line up with our application guide, it will bolt directly in with a perfect factory alignment.
*Note: Always verify exact vehicle compatibility using your vehicle's VIN number, emissions family descriptor tag, or the original stamped part number on your catalyst unit casing before placing an order.
Disclaimer: Product images for reference only. Final replacement hardware items matching parameters such as gaskets, clamps, and sensor ports depend on your kit configuration. Selecting the "Full Kit" option adds the explicitly listed installation components to your shipment. Price is for (1) DOC.
