Cummins B6.7 DOC Filter 2018-2021: OEM 4394940

Emissions System Filter for Cummins B6.7 (2018–2021)

What is it?
The Cummins B6.7 DOC Filter OEM 4394940 is a vital emissions control component fitted inside the Diesel Oxidation Catalyst (DOC) of your engine’s aftertreatment system. It helps oxidize harmful exhaust pollutants—such as hydrocarbons and carbon monoxide—into less harmful compounds before the exhaust continues through the rest of the system, promoting cleaner operation and improved emissions performance.

Why choose OEM 4394940?
This DOC filter is engineered specifically for Cummins B6.7 engines produced between 2018 and 2021. Its exact-fit, OEM-grade construction ensures proper integration with your vehicle’s original aftertreatment hardware, reducing the risk of performance issues and emissions faults. With genuine OEM build quality, you get reliable performance and long-term durability.

Key Benefits
✅ Designed for Cummins B6.7 engines (2018–2021)
✅ Helps lower hydrocarbons and carbon monoxide in exhaust
✅ Supports efficient aftertreatment system function
✅ Built to handle high-temperature exhaust conditions
✅ Direct-fit replacement for easy installation

Applications
This DOC filter is ideal for Cummins B6.7-powered commercial trucks, vocational vehicles, delivery fleets, and other diesel equipment manufactured from 2018 through 2021 that depend on effective emissions control for everyday performance.

Installation Notes
Ensure the exhaust and aftertreatment system are completely cooled before beginning installation. Inspect nearby sensors, gaskets, and connections for signs of wear or contamination. Follow Cummins-recommended installation procedures and torque specifications to ensure a proper seal and reliable system performance. After installation, verify that the emissions system is functioning correctly.

Final Thoughts
When your Cummins B6.7 engine shows emissions-related warnings or reduced aftertreatment efficiency, the OEM 4394940 DOC filter delivers a dependable, OE-grade replacement solution. Built for precise fit and consistent emissions control, it helps keep your engine compliant and running efficiently. Tamerx has this DOC filter in stock and ready to ship.