Cummins L9, B6.7 SCR 2018-2024: OEM 5418654

Unified Emissions Control Solution for Cummins B6.7 & L9 Engines (2018–2024)

What is it?
The Cummins B6.7/L9 SCR assembly, identified by OEM 5418654, is an emissions aftertreatment component used on Cummins B6.7 and L9 diesel engines built between 2018 and 2024. As part of the selective catalytic reduction process, it works with Diesel Exhaust Fluid (DEF) to help convert nitrogen oxides (NOx) in the exhaust into nitrogen and water before the gases exit the system.

Why choose this SCR Assembly?
Emissions systems rely on components that are precisely matched to the engine platform. This SCR unit is manufactured to Cummins’ original specifications for both the B6.7 and L9, ensuring proper fitment and consistent communication with DEF delivery systems, exhaust sensors, and electronic controls. When SCR efficiency drops, emissions alerts and uneven exhaust treatment can occur. Selecting the correct OEM-specified assembly helps maintain predictable aftertreatment operation and stable emissions handling.

Key Benefits
✅ Platform-specific design for Cummins B6.7 and L9 emissions systems
✅ Supports steady NOx conversion through DEF interaction
✅ Helps maintain coordinated operation with other aftertreatment components
✅ Direct replacement with no modification required
✅ Designed to withstand prolonged high-temperature exhaust exposure

Applications
This SCR assembly is used in medium- and heavy-duty vehicles equipped with Cummins B6.7 or L9 engines from the 2018–2024 model years. Typical applications include delivery trucks, vocational fleets, regional transport vehicles, municipal equipment, and other work platforms where consistent emissions control is essential.

Installation Notes
Allow the exhaust and aftertreatment system to cool completely before servicing. Remove the existing SCR unit and inspect nearby DEF lines, sensors, and mounting points for signs of wear or buildup. Install the replacement assembly using appropriate seals and fasteners to ensure correct alignment. After installation, clear stored system codes and verify proper aftertreatment function using diagnostic tools.

Final Thoughts
If your Cummins B6.7- or L9-powered vehicle is experiencing emissions warnings, fluctuating NOx readings, or irregular aftertreatment behavior, replacing the SCR assembly with the correct OEM-specified component can help restore balanced exhaust treatment. The Cummins B6.7/L9 SCR (OEM 5418654) plays an essential role in supporting emissions system stability and dependable vehicle operation.