Enhance Emissions Function on Cummins L9 (2018–2021)
What is it?
The Cummins L9 SCR OEM 4394720 is a key emissions aftertreatment component that helps reduce nitrogen oxide (NOx) pollutants in the exhaust of your diesel engine. Paired with the diesel exhaust fluid (DEF) system, this SCR assembly aids in converting exhaust gases into cleaner byproducts before they exit the vehicle, helping your engine meet emissions standards and maintain consistent operation.
Why choose OEM 4394720?
Manufactured to Cummins’ original specifications for L9 engines built from 2018 through 2021, this OEM SCR assembly ensures proper fit and integration with your vehicle’s factory aftertreatment system. It helps reduce the likelihood of emissions fault codes, warning lights, and engine derates. Choosing an OEM component means a reliable replacement designed for your engine’s exact needs.
Key Benefits
✅ Compatible with Cummins L9 engines (2018–2021)
✅ Supports effective NOx reduction with DEF
✅ Helps minimize emissions system warnings
✅ Built to handle high exhaust temperatures and everyday use
✅ Direct-fit design for more straightforward installation
Applications
This SCR assembly is ideal for on-highway trucks, vocational vehicles, and commercial fleets powered by Cummins L9 engines from 2018–2021. It’s commonly used in delivery rigs, heavy-duty service vehicles, and other diesel-powered equipment requiring dependable emissions control.
Installation Notes
Before installation, allow the exhaust system to cool completely. Inspect related sensors, gaskets, clamps, and mounting hardware for wear, and replace any worn parts as needed. After installing the SCR assembly, confirm all connections are secure and follow manufacturer-recommended system checks or resets.
Final Thoughts
If emissions performance issues arise on your Cummins L9 engine, the OEM 4394720 SCR assembly delivers a dependable, factory-aligned replacement solution. Designed for proper fitment and consistent operation, it helps keep your vehicle compliant and ready for the road. Tamerx has this SCR assembly in stock and ready to ship.