Cummins B6.7, L9 SCR 2022-2024: OEM 5507266

Comprehensive NOx Management for Cummins B6.7 & L9 Engines (2022–2024)

What is it?
The Cummins B6.7/L9 SCR (Selective Catalytic Reduction) assembly, identified by OEM part number 5507266, is an emissions aftertreatment component for Cummins B6.7 and L9 diesel engines manufactured between 2022 and 2024. As part of the SCR system, 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, aiding in emissions compliance.

Why choose this SCR Assembly?
This SCR module is engineered to meet Cummins’ original specifications for both the B6.7 and L9 platforms, ensuring accurate fitment and consistent interaction with DEF dosing systems, emissions sensors, and engine control modules. As components age or accumulate contamination, NOx conversion effectiveness can decline, which may lead to emissions alerts or uneven aftertreatment performance. Installing the correct OEM-specified assembly helps support steady exhaust treatment and more predictable emissions system behavior.

Key Benefits
✅ Designed for Cummins B6.7 and L9 aftertreatment systems (2022–2024)
✅ Helps support consistent NOx conversion with DEF interaction
✅ Promotes coordinated operation with related emissions parts
✅ Direct-fit replacement — no modifications required
✅ Built to withstand demanding exhaust environments

Applications
This SCR assembly is suitable for medium- and heavy-duty trucks and commercial vehicles powered by Cummins B6.7 or L9 engines built between 2022 and 2024. Typical applications include delivery fleets, regional transport rigs, vocational trucks, and other commercial platforms where dependable emissions control and regulatory compliance are essential.

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

Final Thoughts
If your Cummins B6.7 or L9-equipped vehicle is showing NUMx-related alerts, fluctuating emissions readings, or inconsistent aftertreatment performance, replacing the SCR assembly with the correct OEM-specified part can help restore balanced NOx management and smoother exhaust treatment. The Cummins B6.7/L9 SCR (OEM 5507266) plays a key role in managing regulated exhaust chemistry and supporting dependable vehicle operation across varied duty cycles.