Cummins L9 SCR 2022-2024: OEM 5507874

Engine-Matched NOx Reduction for Cummins L9 Engines (2022–2024)

What is it?
The Cummins L9 SCR (Selective Catalytic Reduction) assembly, identified by OEM part number 5507874, is a fundamental emissions aftertreatment component for Cummins L9 diesel engines manufactured between 2022 and 2024. Working with Diesel Exhaust Fluid (DEF), this unit supports the chemical reaction that converts nitrogen oxides (NOx) in the exhaust into nitrogen and water before the gases exit the system, helping the engine meet emissions standards.

Why choose this SCR Assembly?
This SCR module is engineered to Cummins’ original specifications for the L9 platform, ensuring correct fitment and dependable communication with DEF delivery systems, emissions sensors, and engine control modules. As SCR components age or accumulate contamination, their effectiveness can decline, which may lead to reduced NOx conversion efficiency and emissions-related alerts. Installing the correct OEM-specified assembly helps support stable exhaust treatment and coordinated aftertreatment system performance.

Key Benefits
✅ Designed specifically for Cummins L9 aftertreatment systems (2022–2024)
✅ Supports dependable NOx conversion with DEF chemistry
✅ Helps maintain coordinated interaction with related emissions 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 equipped with Cummins L9 engines from 2022–2024. It’s commonly used in delivery fleets, vocational trucks, regional transport rigs, and other commercial platforms where regulated emissions control and reliable exhaust behavior are critical to daily operation.

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

Final Thoughts
If your Cummins L9-equipped vehicle is showing NOx-related warnings, fluctuating emissions readings, or uneven aftertreatment behavior, replacing the SCR assembly with the correct OEM-specified part can help bring back smoother exhaust handling. The Cummins L9 SCR (OEM 5507874) plays an important role in managing regulated emissions chemistry and supporting dependable vehicle operation across demanding duty cycles.