Cummins ISX / ISX15 4353221 / 5287231 / A047V391 / 5298349 DOC Replacement

Restore emissions performance with this premium Skyline aftermarket Cummins ISX 4353221 / 5287231 / A047V391 / 5298349 DOC Filter Inlet Module. This brand-new Diesel Oxidation Catalyst (DOC) serves as a direct-fit alternative to high-traffic OEM numbers 4353221, 5287231, A047V391, 5298349, A035E398, A041P366, 4353221NX, 4353221RX, 5287231NX, 5287231RX, 5298349NX, and 5298349RX. Engineered as an exact-fit replacement for heavy-duty EPA13 / 2013–2016 emissions modules running Cummins ISX, ISX15, and industrial QSX engine platforms, it requires no exhaust system modifications for installation, carries zero core charge, and ships free within the continental United States.

Cummins ISX 4353221 DOC 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:

Choose Your Kit Configuration

Select the stage setup from the product options above that best fits your fleet requirements:

• Full Kit (Best Value): Includes (1) Brand-New Oxidation Catalyst, (1) OEM-quality replacement inlet gasket (2871453), (1) premium exhaust outlet gasket (2866337), (1) heavy-duty alignment mounting clamp (2871863), and (1) heavy-duty industrial assembly hardware clamp (2880483).
• DOC Only: Includes the replacement oxidation module core only. Installation installation service gaskets and clamps are not included.

Key Features & Specifications for Part 4353221 / 5287231 / A047V391

• Built in the USA: Designed, engineered, and manufactured in America.
• No Core Charge: Brand-new aftermarket element; eliminates core handling logistics, core return freight fees, and bank tracking delays.
• Exact-Fit™ Technical Dimensions: Formed with OEM-matching catalytic sizing, accurate sensor bung depths, and rigid factory-spec indexing pins for drop-in aftertreatment section swap without custom fabrication.
• Advanced Washcoat Substrate: High-performance flow-through catalyst core allows proper exhaust temperature generation to support clean DPF passive regeneration downstream.
• 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 on over-the-road equipment.
• Free Shipping: Free ground shipping within the continental United States. Orders submitted before 2:00 PM Eastern ship out the same business day.

Cummins ISX / ISX15 Vehicle Fitment Guide

Direct alternative solution for heavy-duty over-the-road equipment and industrial chassis configurations equipped with compatible aftertreatment platforms from approximately 2013 to 2016 model years. Optimized for:

• Engine Platforms: Cummins ISX, ISX15 heavy-duty diesel engines, and 15-liter Cummins QSX industrial platforms operating under EPA13 rules.
• Chassis Fitments: This physical layout matches factory attachments across line-haul fleets, vocational trucks, motorcoaches, and industrial equipment:
  • Freightliner Platforms: Cascadia and Coronado highway fleets tracking under tracking numbers 4353221 and 5287231.
  • Kenworth Platforms: Conventional tractor setups including models T660, T680, and W900 builds.
  • Peterbilt Platforms: Class 8 configurations including conventional models 389, 567, and 579 lines.
  • International Platforms: Highway tractor builds including ProStar and LoneStar lines tracking under references A047V391 and 5298349.
  • Vocational Markets: Compatible motorcoach buses and stationary industrial applications configured with matching 15L configurations.

Compatible OEM Master Assembly Numbers: 4353439, 5294224, A048D320

Signs Your Diesel Oxidation Catalyst (DOC) Needs Replacement

• Inability to initiate or complete manual parked DPF regenerations due to low face temperature across code sets 4353221 / 5287231
• Raw unburned fuel dripping from exhaust joints or visual engine exhaust face oil fouling at the internal module inlet face
• Active dashboard diagnostic trouble codes (DTCs) reporting low catalyst efficiency or abnormal upstream sensor readings
• Unexplained increase in downstream DPF soot plugging frequency due to catalyst washcoat breakdown

*Note: Always verify exact vehicle compatibility using your vehicle's VIN number, emissions family descriptor tag, or the original stamped OEM part number on your catalyst module casing before placing an order.

Disclaimer: Product images for reference only. Final replacement hardware items matching OEM 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.