Cummins L9 SCR 2022-2024: OEM 5507861

Engine-Specific NOx Control for Cummins L9 Engines (2022–2024)

What is it?
The Cummins L9 SCR (Selective Catalytic Reduction) assembly, carrying OEM part number 5507861, is a critical emissions aftertreatment component designed for Cummins L9 diesel engines manufactured between 2022 and 2024. Working in coordination with Diesel Exhaust Fluid (DEF), this unit facilitates a chemical process that helps convert nitrogen oxides (NOx) in the exhaust into nitrogen and water before the gases leave the system, supporting regulated emissions behavior.

Why choose this SCR Assembly?
This SCR module is engineered to meet Cummins’ original specifications for the L9 platform, ensuring precise fitment and dependable communication with DEF delivery systems, emissions sensors, and engine control electronics. Over time, SCR performance can diminish due to normal use or contamination, which can reduce NOx conversion efficiency and lead to emissions warnings or uneven aftertreatment responses. Choosing the correct OEM-specified assembly helps maintain coordinated exhaust treatment and steadier emissions system behavior.

Key Benefits
✅ Designed specifically for Cummins L9 emissions systems (2022–2024)
✅ Helps support reliable NOx conversion with DEF interaction
✅ Promotes coordinated operation with related aftertreatment parts
✅ Direct-fit replacement — no alterations required
✅ Built for heavy-duty exhaust environments

Applications
This SCR assembly is suited for medium- and heavy-duty trucks and commercial vehicles equipped with Cummins L9 engines built between 2022 and 2024. Typical applications include delivery fleets, vocational trucks, regional transport rigs, and other work platforms where stable emissions control and regulatory compliance are part of everyday operation.

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

Final Thoughts
If your Cummins L9-equipped vehicle is showing NOx-related alerts, inconsistent emissions readings, or irregular aftertreatment behavior, replacing the SCR assembly with the correct OEM-specified part can help restore more balanced exhaust treatment. The Cummins L9 SCR (OEM 5507861) plays a central role in managing regulated exhaust chemistry and supporting dependable vehicle operation across varied duty cycles.