Cummins L9 SCR 2022-2024: OEM 5507875

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

What is it?
The Cummins L9 SCR (Selective Catalytic Reduction) assembly with OEM part number 5507875 is an emissions aftertreatment component developed for Cummins L9 diesel engines produced between 2022 and 2024. Integrated into the exhaust system, this unit works together with Diesel Exhaust Fluid (DEF) to help convert nitrogen oxides (NOx) into nitrogen and water before the gases exit the system, supporting regulated emissions performance.

Why choose this SCR Assembly?
This SCR module is built to meet Cummins’ original specifications for the L9 platform, ensuring proper fitment and reliable interaction with DEF metering components, sensor systems, and engine controls. Over time, SCR units can become less effective due to normal wear or contamination, which may reduce NOx conversion efficiency and trigger emissions alerts or inconsistent aftertreatment behavior. Installing the correct OEM-specified assembly helps support smoother emissions control and coordinated system responses.

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

Applications
This SCR assembly is suitable for medium- and heavy-duty trucks and commercial vehicles equipped with Cummins L9 engines manufactured between 2022 and 2024. Typical applications include delivery fleet units, vocational work trucks, regional transport rigs, and other commercial platforms where regulated emissions control and reliable exhaust behavior are essential.

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

Final Thoughts
If your Cummins L9-equipped vehicle is experiencing NOx-related warnings, inconsistent emissions readings, or uneven aftertreatment behavior, replacing the SCR assembly with the correct OEM-specified component can help restore balanced exhaust treatment and more predictable system function. The Cummins L9 SCR (OEM 5507875) plays a central role in managing regulated exhaust chemistry and supporting dependable vehicle operation across varied duty cycles.