Product Overview
Volvo Mack 21756506 21212407 21756505 Diesel Oxidation Catalyst DOC
Interchange References: 21756506, 21212407, 21756505, 21549371, VNB406-FSS, C0075-ID, 82018, 82018-NCG, C20-0044, GESi-527, 21212522, 21095726, 21212520, 21021850
Restore exhaust aftertreatment performance with this premium aftermarket Volvo Mack 21756506 / 21212407 / 21756505 Diesel Oxidation Catalyst DOC. This brand-new Skyline Diesel Oxidation Catalyst DOC is a direct-fit replacement for Volvo Mack OEM part numbers 21756506, 21212407, and 21756505. Designed for select Volvo D11, Volvo D13, Volvo D16, Mack MP7, Mack MP8, and Mack MP10 diesel engine applications using compatible EPA10 exhaust aftertreatment systems, this DOC installs without exhaust system modifications, carries no core charge, is backed by a 3-year unlimited mileage warranty, and ships free within the continental United States.
Volvo Mack 21756506 21212407 21756505 DOC Cross Reference Table
How to Verify Your Unit: Use the cross-reference table below to compare the original stamped OEM part number on your DOC canister, emissions tag, or catalyst housing with compatible OEM and aftermarket interchange numbers.
| Manufacturer | Cross Reference Part Numbers |
|---|---|
| Volvo Mack OEM | 21756506, 21212407, 21756505 |
| Skyline | VNB406-FSS |
| Roadwarrior | C0075-ID |
| Dinex | 82018, 82018-NCG |
| DuraFit | C20-0044 |
| Global Emission Systems | GESi-527 |
Volvo D11 D13 D16 Mack MP7 MP8 MP10 21756506 DOC Fitment Guide
This Volvo Mack DOC is designed for select Volvo and Mack commercial vehicles configured with compatible EPA10 horizontal exhaust aftertreatment systems. Always verify exact compatibility using your vehicle's VIN number or original stamped OEM part number on the unit before ordering.
- Engine Platforms: Volvo D11, Volvo D13, Volvo D16, Mack MP7, Mack MP8, and Mack MP10 diesel engine applications.
- Approximate Emissions Era: Commonly associated with select EPA10 applications, approximately 2010 to 2016, depending on vehicle configuration.
- Common Chassis Applications: Select Class 8 line-haul, regional-freight, and severe-duty vocational Volvo and Mack chassis with compatible horizontal exhaust systems.
- Compatible OEM Numbers: 21756506, 21212407, 21756505
Compatible OEM Assembly Numbers: 21549371
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) 21212522 inlet flange gasket, one (1) 21095726 outlet flange gasket, one (1) 21212520 mounting clamp, and one (1) 21021850 locking clamp.
- DOC Only: Includes one (1) DOC only. Installation gaskets and clamps are not included.
Volvo Mack 21756506 21212407 21756505 DOC Technical Specifications
| Measurement Parameter | Specification Value |
|---|---|
| Product Type | Diesel Oxidation Catalyst (DOC) |
| Common Search Term | DOC Filter |
| Primary OEM Part Numbers | 21756506, 21212407, 21756505 |
| Manufacturer Part Number | Skyline VNB406-FSS |
| Material | Premium Stainless Steel |
| Weight | 38.81 lbs (17.62 kg) |
| Length | 12.87 inches (326.90 mm) |
| Core Diameter | 12.99 inches (330.00 mm) |
| Overall Dimensions (W x H) | 12.99 x 12.99 inches (330.00 x 330.00 mm) |
| Exhaust Emission Norm | EPA Compliant |
Volvo Mack 21756506 21212407 21756505 DOC Key Features
- Direct-Fit Volvo Mack DOC: Replaces Volvo Mack 21756506, 21212407, and 21756505 diesel oxidation catalyst applications.
- No Core Charge: Brand-new aftermarket DOC with no dirty core return, core tracking paperwork, or return freight expense.
- EPA Compliant: Designed for supported Volvo D11, Volvo D13, Volvo D16, Mack MP7, Mack MP8, and Mack MP10 aftertreatment applications.
- Stainless Steel Construction: Built with premium stainless steel material for durability in heavy-duty exhaust systems.
- Available Full Kit: Full Kit option includes one (1) 21212522 gasket, one (1) 21095726 gasket, one (1) 21212520 clamp, and one (1) 21021850 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.
Signs Your Volvo Mack DOC Needs Replacement
- More frequent or incomplete downstream DPF regeneration cycles.
- Diagnostic trouble codes related to DOC catalyst efficiency or exhaust temperature performance.
- Excessive soot buildup at the catalyst face or in the downstream DPF.
- Unburned fuel residue, contamination, or unusual exhaust odor near the aftertreatment system.
- Increased exhaust backpressure or restriction.
- 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.
