Cummins ISL SCR Outlet Catalyst Module 2018-2022: OEM 4394724
Reliable NOx Reduction for Cummins ISL Engines (2018–2022)
What is it?
The Cummins ISL SCR Outlet Catalyst Module, identified by OEM 4394724, is a key component of the Selective Catalytic Reduction (SCR) aftertreatment system. Positioned near the outlet section of the exhaust assembly, it works with Diesel Exhaust Fluid (DEF) to convert nitrogen oxide (NOx) emissions into harmless nitrogen and water vapor before the exhaust is released. This process helps the engine meet emissions requirements while supporting the efficient operation of the complete aftertreatment system.
Why choose this SCR Outlet Catalyst Module?
Modern diesel engines rely on every aftertreatment component working together to maintain proper exhaust emissions control. The OEM 4394724 SCR Outlet Catalyst Module is engineered specifically for Cummins ISL engines manufactured between 2018 and 2022, providing compatibility with factory-installed emissions components.
Over time, catalyst aging, contamination, excessive heat, DEF-related issues, and prolonged exposure to demanding operating conditions can reduce the module's efficiency. When this occurs, operators may experience emissions warning lights, elevated NOx readings, fault codes, or engine derate conditions. Replacing a worn catalyst module with the correct OEM-matched component helps restore proper exhaust treatment and supports dependable aftertreatment system operation.
Key Benefits
✅ OEM-matched SCR Outlet Catalyst Module for Cummins ISL engines (2018–2022)
✅ Helps convert harmful NOx emissions into nitrogen and water vapor
✅ Supports reliable operation of the complete aftertreatment system
✅ Helps maintain consistent exhaust flow and emissions efficiency
✅ Direct-fit design for straightforward installation
✅ Built for demanding commercial, industrial, and heavy-duty applications
Applications
This SCR Outlet Catalyst Module is designed for Cummins ISL diesel engines manufactured between 2018 and 2022. These engines are commonly used in motorhomes, buses, vocational trucks, municipal fleets, commercial vehicles, and industrial equipment where dependable emissions control and reliable aftertreatment operation are essential.
Installation Notes
Before installation, allow the exhaust system to cool completely. Inspect the DEF injector, NOx sensors, temperature sensors, exhaust piping, clamps, and mounting hardware for contamination, wear, or damage that could affect the new catalyst module. Install the replacement unit using the correct seals and hardware to ensure proper alignment and a leak-free fit. After installation, verify all sensor connections, clear any stored diagnostic fault codes if required, and confirm proper operation of the aftertreatment system before returning the vehicle to service.
Final Thoughts
The SCR Outlet Catalyst Module is a critical component in maintaining efficient exhaust emissions treatment and dependable aftertreatment operation. The Cummins ISL SCR Outlet Catalyst Module (OEM 4394724) provides reliable fitment, effective NOx reduction, and long-lasting durability for 2018–2022 Cummins ISL-powered equipment operating in demanding environments.