Cummins B6.7, L9 SCR 2018-2021: OEM 5418547

Efficient NOx Control for Cummins B6.7 & L9 Engines (2018–2021)

What is it?
The Cummins B6.7/L9 SCR (Selective Catalytic Reduction) module, identified by OEM part number 5418547, is an emissions aftertreatment component designed for Cummins B6.7 and L9 diesel engines produced between 2018 and 2021. It works with Diesel Exhaust Fluid (DEF) to facilitate the conversion of nitrogen oxides (NOx) in the exhaust into nitrogen and water before the gases exit the system, helping maintain emissions compliance in demanding operating conditions.

Why choose this SCR Assembly?
Built to Cummins’ original specifications, this SCR assembly ensures proper fitment and reliable integration with DEF dosing equipment, sensors, and engine control systems on both B6.7 and L9 platforms. As SCR components age or become contaminated, NOx conversion efficiency can decline, potentially resulting in emissions system warnings or erratic aftertreatment behavior. Installing the correct OEM-specified SCR helps preserve consistent emissions management and coordinated exhaust treatment.

Key Benefits
✅ Designed for Cummins B6.7 and L9 aftertreatment systems (2018–2021)
✅ Supports dependable NOx conversion with DEF chemistry
✅ Helps maintain coordinated function with related exhaust components
✅ Direct-fit replacement — no modifications needed
✅ Constructed for heavy-duty exhaust environments

Applications
This SCR module is suited for medium- and heavy-duty commercial vehicles equipped with Cummins B6.7 or L9 engines manufactured between 2018 and 2021. Common applications include delivery trucks, vocational fleets, regional transport rigs, and other work vehicles where regulated emissions control and reliability are essential.

Installation Notes
Allow the exhaust and aftertreatment system to cool completely before starting service. Remove the existing SCR unit and inspect nearby DEF lines, sensors, and mounting hardware for signs of wear, soot buildup, or damage. Install the replacement SCR assembly with appropriate seals and fasteners to ensure a secure, leak-free fit. After installation, clear any stored fault codes and verify correct system operation using diagnostic tools.

Final Thoughts
If your Cummins B6.7 or L9-equipped vehicle is experiencing NOx-related alerts, fluctuating emissions readings, or inconsistent aftertreatment responses, replacing the SCR module with the correct OEM-specified unit can help restore smoother emissions control. The Cummins B6.7/L9 SCR (OEM 5418547) plays a key role in managing regulated exhaust chemistry and supporting dependable vehicle performance across a range of duty cycles.