Cummins L9 SCR 2022-2024: OEM 5507873

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

What is it?
The Cummins L9 SCR (Selective Catalytic Reduction) assembly, identified by OEM part number 5507873, is an emissions aftertreatment module designed for Cummins L9 diesel engines produced between 2022 and 2024. Paired with Diesel Exhaust Fluid (DEF), this unit helps facilitate the conversion of nitrogen oxides (NOx) in the exhaust into nitrogen and water before the gases exit the system, supporting regulated emissions behavior.

Why choose this SCR Assembly?
This SCR unit is built to meet Cummins’ original design specifications for the L9 platform, ensuring precise fitment and dependable interaction with DEF metering components, emissions sensors, and engine control systems. Over time, SCR components can lose effectiveness due to normal use or contamination, which may reduce NOx conversion efficiency and trigger emissions indicators or irregular aftertreatment responses. Installing the correct OEM-specified assembly helps preserve coordinated exhaust treatment and steadier emissions control.

Key Benefits
✅ Designed specifically for Cummins L9 emissions systems (2022–2024)
✅ Helps support reliable NOx conversion with DEF interaction
✅ Encourages smooth coordination with related aftertreatment components
✅ Direct-fit replacement — no alterations required
✅ Constructed for rigorous exhaust environments

Applications
This SCR module is suitable for medium- and heavy-duty vehicles equipped with Cummins L9 engines manufactured between 2022 and 2024. Its typical applications include delivery fleets, vocational trucks, regional transport rigs, and other commercial platforms where dependable emissions control and compliance contribute to operational efficiency.

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

Final Thoughts
If your Cummins L9-equipped vehicle is showing NOx-related warnings, uneven emissions readings, or inconsistent aftertreatment behavior, replacing the SCR assembly with the correct OEM-specified part can help restore smoother emissions control and more reliable exhaust treatment. The Cummins L9 SCR (OEM 5507873) plays a key role in managing regulated exhaust chemistry and supporting dependable vehicle performance across varied duty cycles.