Cummins B6.7, L9 SCR 2022-2024: OEM 5418679

Engine-Matched NOx Control Module for Cummins B6.7 & L9 Engines (2022–2024)

What is it?
The Cummins B6.7/L9 SCR (Selective Catalytic Reduction) assembly, referenced by OEM part number 5418679, is an emissions aftertreatment component used on Cummins B6.7 and L9 diesel engines built between 2022 and 2024. Integrated with the engine’s exhaust system, this unit works with Diesel Exhaust Fluid (DEF) to help transform nitrogen oxides (NOx) in the exhaust into nitrogen and water before the gases exit the system, aiding in emissions compliance.

Why choose this SCR Assembly?
This SCR unit is manufactured to Cummins’ original specifications for both B6.7 and L9 platforms, ensuring a proper fit and reliable integration with DEF delivery hardware, exhaust sensors, and control systems. When SCR components degrade or become less effective from prolonged use, NOx conversion efficiency can decline, potentially leading to emissions warnings or uneven aftertreatment behavior. Installing the correct OEM-specified SCR helps maintain consistent emissions control and coordinated system responses.

Key Benefits
✅ Designed for Cummins B6.7 and L9 aftertreatment systems (2022–2024)
✅ Helps support dependable NOx conversion with DEF chemistry
✅ Promotes coordinated operation with related emissions parts
✅ Direct-fit replacement — no modifications required
✅ Built for demanding exhaust temperatures and heavy-duty use

Applications
This SCR assembly is suitable for medium- and heavy-duty vehicles equipped with Cummins B6.7 or L9 engines manufactured between 2022 and 2024. It’s commonly applied in delivery fleets, vocational trucks, regional transport units, and other commercial platforms where reliable emissions control and regulatory compliance are essential.

Installation Notes
Before servicing, make sure the exhaust and aftertreatment system is completely cooled. Remove the existing SCR module and inspect adjacent DEF lines, sensors, and mounting hardware for signs of wear or soot buildup. Install the replacement SCR assembly using appropriate seals and fasteners to ensure a secure, leak-free fit. After installation, clear any stored system codes and verify correct SCR operation with diagnostic tools.

Final Thoughts
If your Cummins B6.7- or L9-powered vehicle shows NOx-related alerts, uneven emissions readings, or irregular aftertreatment behavior, replacing the SCR assembly with the correct OEM-specified part can help restore balanced emissions control. The Cummins B6.7/L9 SCR (OEM 5418679) plays an important role in managing regulated exhaust chemistry and supporting dependable vehicle operation across varied duty cycles.