Volvo / Mack D13 & MP8 20864129, 21850645, 85001355 Aftermarket DOC Catalyst Kit

Volvo Mack 20864129 21850645 85001355 Diesel Oxidation Catalyst DOC

Interchange References: 20864129, 21850645, 85001355, Q621417, A024N738, A042N738, VNB402-FSS, C0009-ID, 82012, C20-0009, GESi-521, 21371339, 21445458

Restore exhaust aftertreatment performance with this premium aftermarket Volvo Mack 20864129 / 21850645 / 85001355 Diesel Oxidation Catalyst DOC. This brand-new Skyline Diesel Oxidation Catalyst DOC is a direct-fit replacement for Volvo Mack OEM part numbers 20864129, 21850645, and 85001355. Designed for select Volvo D13 and Mack MP8 diesel engine applications using compatible EPA07 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 20864129 21850645 85001355 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.

Volvo D13 Mack MP8 20864129 21850645 DOC Fitment Guide

This Volvo Mack DOC is designed for select Volvo and Mack commercial vehicles configured with compatible EPA07 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 D13 and Mack MP8 diesel engine applications.
• Approximate Emissions Era: Commonly associated with select EPA07 applications, approximately 2007 to 2009, depending on vehicle configuration.
• Common Chassis Applications: Select Volvo VNL, Volvo VNM, Mack Vision, Mack Pinnacle, and other compatible Volvo Mack commercial truck applications using the matching DOC assembly.
• Compatible OEM Numbers: 20864129, 21850645, 85001355

Compatible OEM Assembly Numbers: Q621417, A024N738, A042N738

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, two (2) 21371339 installation gaskets, and two (2) 21445458 heavy-duty mounting clamps.
• DOC Only: Includes one (1) DOC only. Installation gaskets and clamps are not included.

Volvo Mack 20864129 21850645 85001355 DOC Technical Specifications

Volvo Mack 20864129 21850645 85001355 DOC Key Features

• Direct-Fit Volvo Mack DOC: Replaces Volvo Mack 20864129, 21850645, and 85001355 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 D13 and Mack MP8 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 two (2) 21371339 gaskets and two (2) 21445458 clamps.
• 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 accumulation at the catalyst face or in the downstream DPF.
• Unburned fuel residue, unusual exhaust odor, or visible contamination near aftertreatment connections.
• Reduced engine performance associated with exhaust restriction or poor catalyst operation.
• Physical cracking, melting, contamination, or damage to the DOC substrate or housing.

*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.