Restore emissions performance with this premium Skyline aftermarket Cummins / PACCAR 4353249 / 1978266 / A047V447 / 5298340 DOC Inlet Module Replacement. Commonly referred to by fleet owners and maintenance crews as a replacement DOC filter, this brand-new Diesel Oxidation Catalyst (DOC) serves as a direct-fit alternative to high-traffic OEM part numbers 4353249, 1978266, A047V447, 5298340, 5286910, A035E403, A047V562, 1978266PE, 1978266PEX, 4353249NX, 4353249RX, 5298340NX, 5298340RX, 5286910NX, and 5286910RX. Engineered as an exact-fit replacement for heavy-duty 2013 to 2016 aftertreatment modules running Cummins ISX12, ISX15, and QSX engines, this high-efficiency oxidation catalyst requires no exhaust system modifications for installation, carries zero core charge, and ships free within the continental United States.

Cummins / PACCAR 4353249 DOC Inlet Module Cross Reference

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

Choose Your Kit Configuration

Select the configuration setup from the product choices above that best fits your shop's maintenance requirements:

• Full Kit (Best Value): Includes (1) Brand-New Oxidation Catalyst, (1) OEM-quality replacement inlet gasket (2866337), (1) primary hardware gasket (2871453), (1) heavy-duty service clamp (2871863), and (1) assembly hardware clamp (5290118).
• DOC Only: Includes the replacement catalyst module core only. Service gaskets and mounting clamps are not included.

Key Features & Specifications for Part 4353249 / 1978266 / A047V447

• Built in the USA: Designed, engineered, and manufactured in America.
• No Core Charge: Brand-new aftermarket element; completely eliminates tracking core returns, return freight charges, and bank credit delays.
• Exact-Fit™ Technical Dimensions: Formed with OEM-matching physical layout sizing, pre-machined sensor bung placements, and rigid indexing alignment pins for drop-in installation with zero exhaust alterations required.
• Catalyst Substrate Matrix: High-performance flow-through washcoat substrate configuration allows correct exhaust gas temperature generation to properly support downstream DPF passive regeneration.
• Industry-Leading Warranty: Backed by a 3-year unlimited mileage warranty on all Skyline aftermarket solutions.
• EPA Compliant: Complies with federal emissions rules to fulfill required heavy-duty particulate matter reduction parameters.
• Free Shipping: Free ground shipping within the continental United States. Orders submitted before 2:00 PM Eastern ship out the same business day.

Cummins / PACCAR Vehicle Fitment Guide

Direct alternative solution for commercial heavy-duty trucks and vocational equipment configured with compatible emissions systems from approximately 2013 to 2016 chassis layouts. Optimized for:

• Engine Platforms: Cummins ISX15, Cummins ISX12, and QSX 15-liter industrial platforms operating under applicable EPA guidelines.
• Chassis Fitments: This high-volume inlet module layout drops securely into frame attachments across major fleet configurations:
  • Kenworth Platforms: Models T660, T680, and W900 setups tracking under codes 4353249 and 1978266.
  • Peterbilt Platforms: Class 8 conventional applications configured with matching engine packages.
  • Freightliner Platforms: Cascadia and Coronado fleets tracking under codes 5298340 and 5286910.
  • International Platforms: Commercial highway chassis including ProStar and LoneStar tracking layouts.
  • Vocational Markets: Motorcoach buses, concrete mixers, dumps, and stationary industrial blocks.

Signs Your Diesel Oxidation Catalyst (DOC) Needs Replacement

• Inability to initiate or complete manual parked DPF regeneration cycles due to low internal exhaust face temperature generation across numbers 4353249 / 1978266 / A047V447 / 5298340
• Raw unburned fuel dripping from exhaust clamps or heavy oil soot contamination visible on the internal inlet module matrix
• Active dashboard diagnostic trouble codes (DTCs) signaling low catalyst efficiency levels or abnormal upstream sensor delta values
• Unexplained increase in downstream DPF filter 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 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.