Cummins L9 SCR 2022-2024: OEM 5507871

Dependable NOx Reduction for Cummins L9 Engines (2022–2024)

What is it?
The Cummins L9 SCR (Selective Catalytic Reduction) assembly, identified by OEM part number 5507871, is an emissions aftertreatment module designed for Cummins L9 diesel engines manufactured between 2022 and 2024. Working with Diesel Exhaust Fluid (DEF), this component helps convert nitrogen oxides (NOx) in exhaust gases into nitrogen and water before the gases exit the system, supporting ongoing emissions compliance.

Why choose this SCR Assembly?
This SCR unit is made to meet Cummins’ original specifications for the L9 platform, ensuring proper fitment and reliable interaction with DEF delivery systems, emissions sensors, and engine control systems. Over time, SCR performance can diminish due to normal wear or contamination, which may reduce NOx conversion efficiency and trigger emissions alerts or irregular aftertreatment behavior. Installing the correct OEM-specified part helps maintain smoother emissions control and coordinated exhaust treatment.

Key Benefits
✅ Specifically designed for Cummins L9 emissions systems (2022–2024)
✅ Helps sustain dependable NOx conversion with DEF chemistry
✅ Supports coordinated operation alongside other aftertreatment parts
✅ Direct-fit replacement — no modifications required
✅ Built for demanding exhaust environments

Applications
This SCR assembly fits medium- and heavy-duty vehicles powered by Cummins L9 engines from 2022 through 2024. It’s commonly used in delivery rigs, vocational trucks, regional freight units, and other commercial applications where reliable emissions control and compliance are essential.

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

Final Thoughts
If your Cummins L9-equipped vehicle shows NOx-related warnings, inconsistent emissions readings, or uneven aftertreatment behavior, replacing the SCR assembly with the correct OEM-specified part can help restore more balanced exhaust treatment. The Cummins L9 SCR (OEM 5507871) plays an important role in managing regulated exhaust chemistry and supporting dependable vehicle performance across varied duty cycles.