Product Overview
Volvo 20863840 21850643 Mack Diesel Oxidation Catalyst DOC
Interchange References: Volvo/Mack 20863840 and 21850643, additional OEM references Q621413 and A042N736, Skyline VN0401, FSS Emission Products VN0401-FSS, Roadwarrior C0008-ID, DuraFit C20-0008, Dinex 82016, Global Emission Systems GESi-534, gaskets 2871453, clamps 2871863
Replace a worn or damaged Volvo 20863840 or 21850643 Diesel Oxidation Catalyst DOC with this brand-new Skyline aftermarket DOC filter. This direct-fit replacement is intended for select Volvo D11 and Mack MP7 diesel engine applications using compatible EPA07 exhaust aftertreatment systems, including select regional transport, vocational, dump-truck, delivery-truck, day-cab, and bus configurations. This DOC has no core charge, includes a 3-year unlimited mileage warranty, is EPA compliant, and ships free within the continental United States.
Volvo Mack DOC Cross Reference Table
Volvo and Mack 20863840 and 21850643 DOC filters cross-reference with Skyline VN0401 and the additional OEM and aftermarket replacement numbers listed below.
| Manufacturer | Cross Reference Part Numbers |
|---|---|
| Volvo/Mack OEM | 20863840, 21850643 |
| Additional OEM References | Q621413, A042N736 |
| Skyline | VN0401 |
| FSS Emission Products | VN0401-FSS |
| Roadwarrior | C0008-ID |
| DuraFit | C20-0008 |
| Dinex | 82016 |
| Global Emission Systems | GESi-534 |
Volvo D11 Mack MP7 DOC Fitment Guide
This Skyline DOC filter is intended for select commercial diesel applications equipped with compatible Volvo D11 or Mack MP7 EPA07 exhaust aftertreatment systems. Exact compatibility varies by engine calibration, emissions family, model year, chassis configuration, exhaust layout, and the original stamped DOC part number.
- Engine Platforms: Select Volvo D11 and Mack MP7 diesel engines
- Approximate Model Years: Select 2007–2009 applications
- Approximate Emissions Era: EPA07 exhaust aftertreatment applications
- Common Chassis Applications: Select regional transport, vocational, dump-truck, delivery-truck, day-cab, and bus configurations
- Compatible OEM Numbers: 20863840, 21850643, Q621413, and A042N736
Choose Your Kit Configuration
Select the configuration from the product options that best fits your installation needs.
- Full Kit (Best Value): Includes one (1) brand-new DOC unit, two (2) 2871453 installation gaskets, and two (2) 2871863 heavy-duty clamps
- 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 Terms | DOC, DOC Filter, Diesel Oxidation Catalyst |
| Engine Compatibility | Select Volvo D11 and Mack MP7 applications |
| Material | Stainless steel |
| Weight | 26.31 lb (11.94 kg) |
| Overall Length | 6.95 in (176.53 mm) |
| Outer Body Diameter | 13.17 in (334.60 mm) |
| Dimensions | 13.17 × 13.17 in (334.60 × 334.60 mm) |
| Core Condition | Brand-new aftermarket unit |
| Core Charge | No core charge |
| Warranty | 3-year unlimited mileage warranty |
| Exhaust Emission Norm | EPA07 compliant |
Key Features
- Direct-fit replacement for the listed Volvo and Mack OEM applications
- Brand-new Skyline aftermarket Diesel Oxidation Catalyst DOC
- No core charge or used catalyst return required
- Stainless steel construction
- EPA compliant for applicable federal emissions applications outside California
- Available Full Kit with two 2871453 gaskets and two 2871863 clamps
- Ships free within the continental United States
- Backed by a 3-year unlimited mileage warranty
Signs Your DOC Needs Replacement
- Difficulty reaching or maintaining exhaust temperatures needed for DPF regeneration
- Frequent, incomplete, or unsuccessful regeneration cycles
- Diagnostic trouble codes related to DOC catalyst efficiency or exhaust temperature response
- Excessive soot loading in the downstream DPF
- Fuel, oil, or other contamination visible at the catalyst inlet
- Increased exhaust backpressure or reduced engine performance
- Cracking, melting, corrosion, or other physical damage to the catalyst 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 installation gaskets or clamps included.
