Cummins L9 SCR 2022-2024: OEM 5418547

Reliable NOx Conversion System for Cummins L9 Engines (2022–2024)

What is it?
The Cummins L9 SCR (Selective Catalytic Reduction) unit with OEM part number 5418547 is a core emissions aftertreatment component for Cummins L9 diesel engines manufactured from 2022 to 2024. This module works in conjunction with Diesel Exhaust Fluid (DEF) to facilitate a chemical reaction that turns nitrogen oxides (NOx) in the exhaust into harmless nitrogen and water before the gases exit the system, helping the engine meet emissions standards.

Why choose this SCR Assembly?
Built to Cummins’ exact specifications for the L9 platform, this SCR assembly ensures proper fit and dependable interaction with DEF delivery components, emissions sensors, and engine control systems. When SCR modules start to lose effectiveness due to age, contamination, or prolonged service, NOx conversion efficiency may decrease, potentially leading to warning indicators or irregular exhaust behavior. Installing the correct OEM-specified SCR helps maintain consistent emissions control and coordinated aftertreatment performance.

Key Benefits
✅ Designed specifically for Cummins L9 emissions systems (2022–2024)
✅ Helps sustain dependable NOx conversion with DEF interaction
✅ Supports coordinated operation with other aftertreatment components
✅ Direct-fit replacement — no modifications required
✅ Engineered for heavy-duty exhaust environments

Applications
This SCR assembly is suitable for medium- and heavy-duty trucks and commercial equipment powered by Cummins L9 engines manufactured between 2022 and 2024. It’s commonly used in delivery fleets, vocational rigs, regional transport vehicles, and other commercial platforms where stable emissions behavior and regulatory compliance are essential.

Installation Notes
Before servicing, allow the exhaust and aftertreatment system to fully cool. Remove the existing SCR unit and inspect nearby DEF lines, sensors, and mounting hardware for wear or soot buildup. Install the replacement SCR assembly using proper seals and fasteners to ensure a secure, leak-free fit. After installation, clear any stored system codes and verify correct operation using diagnostic tools.

Final Thoughts
If your Cummins L9-equipped vehicle is experiencing NOx-related warnings or uneven emissions control, replacing the SCR module with the correct OEM-specified part can help restore balanced aftertreatment performance. The Cummins L9 SCR (OEM 5418547) plays an important role in managing regulated exhaust chemistry and supporting dependable vehicle operation across varied duty cycles.