Cummins L9 SCR 2022-2024: OEM 5507871

Purpose-Built NOx Control for Cummins L9 Engines (2022–2024)

What is it?
The Cummins L9 SCR (Selective Catalytic Reduction) assembly, designated by OEM part number 5507871, is an emissions aftertreatment module designed for Cummins L9 diesel engines manufactured between 2022 and 2024. Working in conjunction with Diesel Exhaust Fluid (DEF), this unit supports a chemical process that helps convert nitrogen oxides (NOx) in the exhaust into nitrogen and water before the gases exit the system, contributing to regulated emissions performance.

Why choose this SCR Assembly?
This SCR unit is engineered to Cummins’ original design specifications for the L9 platform, ensuring proper fitment and reliable integration with DEF delivery systems, emissions sensors, and engine control electronics. Over time, SCR components may lose effectiveness due to normal use or contamination, which can reduce NOx conversion efficiency and lead to emissions warnings or uneven aftertreatment behavior. Installing the correct OEM-specified SCR helps maintain coordinated exhaust treatment and steadier system responses.

Key Benefits
✅ Designed specifically for Cummins L9 emissions systems (2022–2024)
✅ Supports dependable NOx conversion with DEF chemistry
✅ Promotes coordinated operation with related aftertreatment components
✅ Direct-fit replacement — no modifications required
✅ Built for heavy-duty exhaust environments

Applications
This SCR assembly is suitable for medium- and heavy-duty vehicles powered by Cummins L9 engines manufactured between 2022 and 2024. It is commonly applied in delivery fleets, vocational trucks, regional transport rigs, and other commercial platforms where consistent emissions control and regulatory compliance are important to daily use.

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

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