Cummins B6.7 DOC Filter 2022-2024: OEM 4394883

A Reliable DOC Solution for Cummins L9 Engines

What is it?
The Diesel Oxidation Catalyst (DOC) filter for the Cummins B6.7 engine (model years 2022–2024), OEM reference 4394883, is a key emissions-control component. It converts hydrocarbons (HC) and carbon monoxide (CO) in the exhaust stream into cleaner, less harmful gases, helping the aftertreatment system maintain stable, reliable operation.

Why choose this DOC Filter?
Built to match original equipment specifications for the B6.7 platform, this DOC filter offers precise fitment and dependable integration with the exhaust and aftertreatment system. A mismatched, worn, or blocked component can result in increased exhaust restriction, frequent regeneration cycles, or emissions-related fault codes. Installing the correct DOC filter supports consistent exhaust flow and dependable system behavior.

Key Benefits
✅ Converts HC and CO into cleaner exhaust output
✅ Supports proper function of downstream aftertreatment components
✅ Helps maintain steady exhaust flow and reduce restriction
✅ Direct-fit design — no modifications required
✅ Designed for heavy-duty, high-temperature operating environments

Applications
Ideal for medium- and heavy-duty trucks, commercial vehicles, and equipment powered by Cummins B6.7 engines from model years 2022 through 2024. This DOC filter is particularly suitable for fleet, vocational, and on-road duty cycles where emissions compliance and dependable aftertreatment performance are essential.

Installation Notes
Before beginning service, ensure the exhaust and aftertreatment system has fully cooled. Remove the existing DOC filter and inspect the surrounding exhaust piping, sensors, and mounting hardware for soot buildup, damage, or wear. Install the replacement using fresh clamps, gaskets, and seals. After installation, clear any stored emissions-system fault codes and verify proper exhaust system behavior through diagnostic checks.

Final Thoughts
If your B6.7-equipped vehicle is experiencing increased exhaust restriction, emissions warnings, or irregular aftertreatment behavior, replacing the DOC filter with the correct OEM-specified unit is a practical step toward restoring clean, dependable exhaust flow. This component plays a crucial role in maintaining the emissions-control system’s integrity and supporting reliable equipment operation.