Cummins 4394862 / A055N991 / 5508220 / 5508221 DOC Inlet Module Replacement

$1,630.00
SKU:
LJ0440-FSS
Condition:
New
Availability:
In Stock - We sell filters locally that could affect real-time inventory – You will be contacted immediately if there are any availability issues
Features:
Proudly Made in America – EPA Compliant – No Core Required – Same fit and Performance as original equipment
Shipping:
Free Ground (Continental USA) - Overnight & Expedited Options Available - Orders After 2PM EST Ship the following Day
Warranty:
3-year, unlimited mileage warranty
OEM Cross Reference:
4394862, 4394862RX, A055N991
Aftermarket Cross Reference:
GESi-581, LJ0440
California Orders:
NOT for sale or shipment to California
Cummins 4394862 / A055N991 DOC Inlet Module Replacement

Have questions? Call an expert at 760-355-8900, 9am - 9pm EST

Product Overview

Aftermarket Replacement for Cummins 4394862 / A055N991 / 5508220 / 5508221 DOC

Interchangeable Component Configurations: 4394862 | A055N991 | 5508220 | 5508221 | 4394862NX | 4394862RX

Restore commercial fleet emissions performance with this premium Skyline aftermarket Cummins 4394862 / A055N991 / 5508220 / 5508221 DOC Inlet Module Replacement. Also acting as a high-efficiency direct-fit DOC filter alternative, this brand-new flow-through catalyst module serves as a direct counter-part to OEM cross-references 4394862, A055N991, 4394862NX, and 4394862RX. Engineered for exact physical proximity within medium-duty commercial vehicles, it installs cleanly with no exhaust system modifications, carries zero core charge, and ships free within the continental United States.

✓ Free Shipping
✓ EPA Compliant

Cummins 4394862 Cross Reference

How to Verify Your Unit: This direct-fit replacement replaces components stamped with housing numbers, casting codes, or tag profiles matching any of the interchangeable manufacturing references listed below:

Manufacturer Cross Reference Part Numbers
Cummins 4394862, 4394862NX, 4394862RX, A055N991
Skyline LJ0440, LJ0440-C, LJ0440-M
GESi GESI-581

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 Component, (1) installation gasket (2871772), (1) installation gasket (2866636), (1) heavy-duty clamp (5417471), and (1) heavy-duty clamp (2880482).
  • Component Only: Includes core unit only. Hardware items excluded.

Key Features & Specifications for Part 4394862 / A055N991

  • Proudly Built in the USA: Designed, engineered, and manufactured in America.
  • No Core Charge: Brand-new aftermarket component; completely eliminates dirty core tracking and return hassles.
  • Exact-Fit™ Technical Dimensions: Built with matching inlet/outlet outer diameters, pre-machined sensor ports, and specialized body hanger brackets for zero exhaust system modifications.
  • Substrate Performance Matrix: Advanced flow-through catalyst core uses verified washcoat metal loading to sustain exhaust temperature control and lower backpressure limits.
  • Industry-Leading Warranty: Backed by an extensive 3-year unlimited mileage coverage matrix.
  • EPA Compliant: Meets federal emissions standards for legal installation nationwide.
  • Fast Free Shipping: Free ground freight within the continental United States. Orders confirmed before 2:00 PM Eastern ship out the same business day.

Cummins Vehicle Fitment Guide

Direct alternative solution for approximately 2017 and newer (EPA17) model year vehicles running mid-range transportation and vocational architectures with horizontal chassis exhaust configurations. Deployed widely across standard Class 6, Class 7, and specialized chassis networks:

  • Freightliner / DTNA Applications: Heavy vocational conventional setups, severe-duty service trucks, and Freightliner Custom Chassis Corporation (FCCC) specialized package chassis lines tracking under codes 4394862 and A055N991.
  • Specialty Vocational Networks: Commercial configurations deployed across fleet platforms for Autocar yard tractive lines, E-ONE fire apparatus vehicle frames, and specialized truck architectures matching element dimensions.
  • Bus Fleet Systems: Heavily optioned across transit passenger frameworks and school route buses built by Blue Bird, Thomas Built (Saf-T-Liner C2), and IC Bus (CE Series).

Compatible OEM Master 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 Diesel Oxidation Catalyst (DOC) Needs Replacement

  • Frequent, unprompted, or incomplete DPF regeneration cycles triggered by active trouble codes matching 4394862 / A055N991
  • Excessive particulate soot face-plugging or heavy face mask scaling across the internal catalyst face assembly
  • Active dashboard diagnostic trouble codes (DTCs) pointing directly to poor catalyst conversion efficiencies
  • Unexplained commercial engine backpressure spikes or noticeable horsepower deterioration under loaded trailer pulls

*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.

California Shipping Notice: This product is EPA compliant but is NOT for sale in California and cannot be shipped to a California address.

Disclaimer: Product images for reference only. Hardware depends on configuration. Price is for (1) unit.

Warranty Information

Skyline Emissions, Inc., offers a 3-year, unlimited mileage warranty on all their DPFs and DOCs.