Cummins B6.7, L9 SCR 2018-2024: OEM 5418530

Unified NOx Management Module for Cummins B6.7 & L9 Engines (2018–2024)

What is it?
The Cummins B6.7/L9 SCR (Selective Catalytic Reduction) assembly, identified by OEM part number 5418530, is a designed emissions aftertreatment component for Cummins B6.7 and L9 diesel engines built from 2018 through 2024. It works with Diesel Exhaust Fluid (DEF) to facilitate a chemical reaction that converts nitrogen oxides (NOx) in exhaust gases into nitrogen and water before they leave the system, helping meet regulated emissions requirements.

Why choose this SCR Assembly?
This SCR unit is engineered to Cummins’ original specifications for both B6.7 and L9 engine platforms, ensuring proper fitment and seamless integration with DEF dosing hardware, emissions sensors, and control systems. When SCR components weaken over time, NOx conversion effectiveness can drop and trigger emissions indicators or inconsistent aftertreatment performance. Installing the correct OEM-specified unit helps keep emissions behavior steady and coordinated across the entire aftertreatment system.

Key Benefits
✅ Designed for Cummins B6.7 and L9 aftertreatment systems (2018–2024)
✅ Helps support dependable NOx conversion with DEF interaction
✅ Promotes coordinated operation with other emissions components
✅ Direct-fit replacement — no fabrication required
✅ Built to endure demanding exhaust temperatures and heavy-duty duty cycles

Applications
This SCR assembly is suited for medium- and heavy-duty trucks and commercial vehicles powered by Cummins B6.7 or L9 engines manufactured between 2018 and 2024. It’s commonly installed in delivery fleets, vocational trucks, regional transport rigs, and other commercial platforms where consistent emissions control and compliance are part of daily operation.

Installation Notes
Before servicing, ensure the exhaust and aftertreatment system has fully cooled. Remove the existing SCR module and inspect adjacent DEF lines, sensors, and mountings for signs of soot buildup, wear, or damage. 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 SCR function with diagnostic tools.

Final Thoughts
If your Cummins B6.7 or L9-equipped vehicle is showing NOx-related alerts or erratic aftertreatment behavior, replacing the SCR assembly with the correct OEM-specified part can help restore stable emissions performance. The Cummins B6.7/L9 SCR (OEM 5418530) plays a crucial role in managing regulated exhaust chemistry and supporting reliable vehicle operation across a wide range of duty cycles.