Cummins B6.7, L9 DOC Filter 2018-2024: OEM 4395113

Consistent Exhaust Filtration for Cummins B6.7 & L9 Engines

What is it?
The Diesel Oxidation Catalyst (DOC) filter for Cummins B6.7 and L9 engines (model years 2018–2024), OEM reference 4395113, is a key emissions-control component. It helps convert hydrocarbons (HC) and carbon monoxide (CO) in the exhaust stream into cleaner, less harmful gases, supporting the aftertreatment system in maintaining steady and reliable operation.

Why choose this DOC Filter?
Designed to meet original equipment specifications for both B6.7 and L9 platforms, this DOC filter offers precise fitment and dependable integration with the exhaust and aftertreatment system. A mismatched, worn, or blocked filter can lead to increased exhaust restriction, more frequent regeneration events, or emissions-related fault codes. Installing the correct DOC filter supports consistent exhaust flow and dependable system performance.

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
✅ Built for heavy-duty, high-temperature operating environments

Applications
Ideal for medium- and heavy-duty trucks, commercial vehicles, and equipment powered by Cummins B6.7 or L9 engines from model years 2018 through 2024. This DOC filter is especially suitable for fleet, vocational, and on-road applications where emissions control and dependable system behavior are essential.

Installation Notes
Before servicing, make sure the exhaust and aftertreatment system has fully cooled. Remove the existing DOC filter and inspect nearby exhaust piping, sensors, and mounting hardware for soot buildup, cracks, or signs of 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 via diagnostic checks.

Final Thoughts
If your B6.7- or L9-equipped vehicle is showing signs of elevated exhaust restriction, frequent regeneration interruptions, or emissions-related system alerts, replacing the DOC filter with the correct OEM-specified unit is a practical way to restore clean, dependable exhaust flow. This component plays a key role in maintaining the integrity of the emissions-control system and supporting reliable equipment performance.