Product Overview
Cummins 4394862 A055N991 5508220 5508221 Diesel Oxidation Catalyst DOC
Interchange References: 4394862, 4394862NX, 4394862RX, A055N991, 5508220, 5508221, LJ0440, LJ0440-M, LJ0440-C, LJ0440-FSS, GESi-581, 2871772, 2866636, 5417471, 2880482
Cummins 4394862 A055N991 DOC Cross Reference Table
How to Verify Your Unit: This direct-fit Diesel Oxidation Catalyst replaces Cummins DOC units stamped with any of the OEM or aftermarket cross-reference numbers listed below.
| Manufacturer | Cross Reference Part Numbers |
|---|---|
| Cummins OEM | 4394862, 4394862NX, 4394862RX, A055N991 |
| Skyline | LJ0440, LJ0440-M, LJ0440-C |
| FSS Emission Products | LJ0440-FSS |
| Global Emission Systems | GESi-581 |
Restore exhaust aftertreatment performance with this premium aftermarket Cummins Diesel Oxidation Catalyst DOC. This brand-new Skyline DOC inlet module is a direct-fit replacement for Cummins 4394862, A055N991, 4394862NX, and 4394862RX, with additional compatible Skyline, FSS Emission Products, and Global Emission Systems cross-reference numbers listed in the table above. Designed for select 2017 and newer Cummins medium-duty, vocational, bus, and specialty chassis aftertreatment applications, this DOC installs without exhaust system modifications, carries no core charge, is backed by a 3-year unlimited mileage warranty, is EPA compliant, and ships free within the continental United States.
Choose Your Kit Configuration
Select the setup from the product options above that best fits your shop's needs:
- Full Kit (Best Value): Includes one (1) brand-new DOC unit, one (1) 2871772 installation gasket, one (1) 2866636 installation gasket, one (1) 5417471 heavy-duty clamp, and one (1) 2880482 heavy-duty clamp.
- DOC Only: Includes one (1) DOC only. Installation gaskets and clamps are not included.
DOC Technical Specifications
| Measurement Parameter | Specification Value |
|---|---|
| Product Type | Diesel Oxidation Catalyst (DOC) Inlet Module |
| Common Search Term | DOC Filter |
| Primary OEM Part Numbers | 4394862, A055N991 |
| Additional OEM Numbers | 4394862NX, 4394862RX |
| Manufacturer Part Number | Skyline LJ0440 |
| Application Type | Medium-Duty, Vocational, Bus, and Specialty Chassis Applications |
| Core Condition | Brand-New Aftermarket Unit |
| Core Charge | No Core Charge |
| Warranty | 3-Year Unlimited Mileage Warranty |
| Emission Standard | EPA Compliant / EPA17 |
Key Features
- Direct-Fit Cummins DOC: Replaces Cummins diesel oxidation catalyst applications listed in the cross-reference table above.
- No Core Charge: Brand-new aftermarket DOC with no dirty core return, core tracking paperwork, or return freight expense.
- EPA Compliant: Designed for supported Cummins medium-duty, vocational, bus, and specialty chassis aftertreatment applications.
- Brand-New Unit: New aftermarket Diesel Oxidation Catalyst rather than a remanufactured core.
- Available Full Kit: Full Kit option includes one (1) 2871772 gasket, one (1) 2866636 gasket, one (1) 5417471 clamp, and one (1) 2880482 clamp.
- Free Shipping: Free ground shipping within the continental United States. Orders placed before 2:00 PM Eastern ship out the same business day when inventory is available.
- Warranty Protection: Backed by a 3-year unlimited mileage warranty.
Cummins 4394862 A055N991 DOC Fitment Guide
This Cummins DOC inlet module is designed for select 2017 and newer medium-duty, vocational, bus, and specialty chassis applications equipped with compatible Cummins exhaust aftertreatment systems.
- Approximate Emissions Era: Commonly associated with select EPA17 / 2017 and newer applications, depending on vehicle configuration.
- Freightliner / DTNA Applications: Select heavy vocational conventional trucks, severe-duty service trucks, and Freightliner Custom Chassis Corporation (FCCC) package chassis using the matching DOC assembly.
- Specialty Vocational Applications: Select Autocar yard tractor platforms, E-ONE fire apparatus frames, and specialty truck applications using compatible exhaust layouts.
- Bus Applications: Select Blue Bird, Thomas Built Saf-T-Liner C2, and IC Bus CE Series school bus or transit bus applications.
- Compatible OEM Numbers: 4394862, 4394862NX, 4394862RX, and A055N991.
Compatible OEM Assembly Numbers: 5508220, 5508221, 5508229, 5508231, 5508232, 5508234, 5508237, 5508238, 5508240, 5508244, 5508245, 5508256, 5508258, 5508259, 5508261, 5508262, 5508264, 5508265, 5508266, 5508756, 5508790, 5508791, 5508792, 5508793, 5508794, A062K642, A062K646, A062K654, A062K658, A062K700, A062K701, A062K704, A062K709, A062K710, A062K713, A062K714, A062X018, A062X020, A062X021, A062X023, A062X024, A062X026, A062X027, A062X028, A062X037, A063H679, A063H680, A063H681, A063H682, A063H683
Signs Your DOC Needs Replacement
- Difficulty reaching or maintaining the exhaust temperatures needed for DPF regeneration.
- Frequent, incomplete, or unsuccessful regeneration cycles.
- Diagnostic trouble codes related to DOC catalyst efficiency or exhaust temperature performance.
- Excessive soot loading in the downstream DPF.
- Fuel, oil, or other contamination visible at the catalyst inlet.
- Increased exhaust backpressure or reduced engine performance.
- Physical cracking, melting, corrosion, or damage to the DOC substrate or housing.
Multi-Warehouse Dispatch
Orders ship from regional fulfillment hubs to help provide fast delivery to your repair shop or location.
*Note: Always verify exact compatibility using your vehicle's VIN number or original stamped OEM part number on the unit before placing an order.
Disclaimer: Product images are for reference only. Each selected option includes one (1) physical DOC unit. The Full Kit option includes one DOC with the listed gaskets and clamps. The DOC Only option includes one DOC only, with no gaskets or clamps included.
