Advanced Emissions Filtration for Cummins B6.7 & L9 (2018–2024)
What is it?
The Cummins B6.7, L9 DOC Filter OEM 4394940 is a key emissions control component installed in the Diesel Oxidation Catalyst (DOC) of your engine’s aftertreatment system. It plays a crucial role in converting harmful exhaust pollutants—such as hydrocarbons and carbon monoxide—into less harmful compounds before they continue through the rest of the emissions system, helping your engine run cleaner and more efficiently.
Why choose OEM 4394940?
This DOC filter is specifically designed for Cummins B6.7 and L9 engines manufactured between 2018 and 2024. With its exact-fit OEM design, it integrates seamlessly with your vehicle’s original emissions components, helping minimize system faults and maintain dependable performance. Genuine OEM construction ensures durability and emissions control you can count on over time.
Key Benefits
✅ Built for 2018–2024 Cummins B6.7 & L9 engines
✅ Helps reduce hydrocarbons and carbon monoxide in exhaust
✅ Supports smoother aftertreatment system operation
✅ Designed to withstand high-temperature exhaust conditions
✅ Direct-fit replacement for simplified installation
Applications
This DOC filter is ideal for Cummins-powered commercial trucks, vocational vehicles, delivery fleets, and other diesel equipment produced from 2018 through 2024 that rely on compliant and effective emissions control systems for daily operation.
Installation Notes
Before installation, ensure the exhaust and aftertreatment system are fully cooled. Inspect adjacent sensors, gaskets, and connectors for wear or contamination. Follow Cummins-recommended installation procedures and torque specifications to ensure proper sealing and reliable function. After installation, confirm that the emissions system is operating correctly.
Final Thoughts
If your Cummins B6.7 or L9 engine shows emissions-related alerts or declining aftertreatment performance, the OEM 4394940 DOC filter delivers a dependable, OE-grade replacement option. Designed for precise fit and trusted emissions control, it helps keep your engine compliant and running efficiently. Tamerx has this DOC filter in stock and ready to ship.