Cummins L9 SCR 2022-2024: OEM 5418545

Engineered NOx Reduction for Cummins L9 Engines (2022–2024)

What is it?
The Cummins L9 SCR (Selective Catalytic Reduction) module with OEM part number 5418545 is an emissions aftertreatment component designed for Cummins L9 diesel engines produced between 2022 and 2024. Working together with Diesel Exhaust Fluid (DEF), this unit helps convert nitrogen oxides (NOx) in the exhaust into nitrogen and water before the gases exit the system, supporting compliance with modern emissions standards.

Why choose this SCR Assembly?
This SCR module is built to Cummins’ original specifications for the L9 platform, ensuring a proper fit and seamless interaction with DEF delivery hardware, exhaust sensors, and the engine’s control systems. When SCR components become less effective due to age or contamination, NOx conversion efficiency can deteriorate and lead to emissions alerts or inconsistent aftertreatment behavior. Installing the correct OEM-specified assembly helps maintain dependable NOx control and coordinated system performance.

Key Benefits
✅ Designed specifically for Cummins L9 aftertreatment systems (2022–2024)
✅ Helps sustain reliable NOx conversion through DEF interaction
✅ Supports coordinated operation with related emissions components
✅ Direct-fit replacement — no modifications required
✅ Built for heavy-duty exhaust conditions and extended service

Applications
This SCR module is suitable for medium- and heavy-duty vehicles equipped with Cummins L9 engines manufactured between 2022 and 2024. It is commonly applied in delivery fleets, vocational rigs, regional transport trucks, and other commercial platforms where stable emissions performance and regulatory compliance are essential.

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

Final Thoughts
If your Cummins L9-powered vehicle is experiencing NOx-related alerts or fluctuating aftertreatment behavior, replacing the SCR module with the correct OEM-specified part can help restore balanced emissions control. The Cummins L9 SCR (OEM 5418545) plays a central role in managing regulated exhaust chemistry and supporting reliable engine use across demanding duty cycles.