Dependable Aftertreatment Filtration for Cummins B6.7 & L9 (2018–2024)
What is it?
The Cummins B6.7, L9 DOC Filter OEM 4394820 is an essential emissions control component placed in the Diesel Oxidation Catalyst (DOC) of your engine’s aftertreatment system. It works to convert harmful pollutants like hydrocarbons and carbon monoxide into less harmful compounds before the exhaust moves further through the emissions system, promoting cleaner operation and compliance with emissions standards.
Why choose OEM 4394820?
This DOC filter is engineered specifically for Cummins B6.7 and L9 engines built between 2018 and 2024. Its precise fit and OEM-quality construction ensure reliable performance and proper integration with your existing aftertreatment system, helping reduce faults and maintain consistent emissions control over the long term.
Key Benefits
✅ Designed for 2018–2024 Cummins B6.7 & L9 engines
✅ Helps reduce hydrocarbons and carbon monoxide in exhaust
✅ Supports smoother emissions system function
✅ Built to handle high-temperature exhaust conditions
✅ Direct-fit replacement for simpler installation
Applications
This DOC filter is ideal for Cummins-powered commercial trucks, vocational vehicles, fleet trucks, and other diesel equipment from 2018 through 2024 that require effective and compliant emissions control systems for daily operation.
Installation Notes
Before installation, ensure the exhaust and aftertreatment system are fully cooled down. Check nearby sensors, gaskets, and connectors for wear or contamination. Follow Cummins-recommended procedures and torque specifications to ensure proper sealing and component function. After installation, verify that the emissions system is functioning as expected.
Final Thoughts
If your Cummins B6.7 or L9 engine is showing emissions-related alerts or reduced aftertreatment efficiency, the OEM 4394820 DOC filter provides an OE-grade replacement solution you can count on. Designed for accurate fit and trusted performance, it helps keep your engine compliant and running efficiently. Tamerx has this DOC filter in stock and ready to ship.