Cummins X15 SCR 2018-2021: OEM 5418501

Engine-Matched Aftertreatment Catalyst for Cummins X15 Engines (2018–2021)

What is it?
The Cummins X15 SCR (Selective Catalytic Reduction) unit for model years 2018–2021, identified by OEM part number 5418501, is a critical component of the engine’s emissions aftertreatment system. It reduces oxides of nitrogen (NOx) in the exhaust stream through a controlled chemical reaction with Diesel Exhaust Fluid (DEF), converting harmful emissions into nitrogen and water vapor before the exhaust exits the system.

Why choose this SCR Assembly?
This SCR assembly is engineered to meet Cummins’ original specifications for X15 engines, ensuring proper fitment and integration with aftertreatment sensors and controls. When an SCR component becomes damaged or degraded, NOx reduction efficiency can decline and emissions-related alerts may occur. Choosing the correct OEM-specified SCR helps maintain coordinated aftertreatment behavior and consistent emissions control.

Key Benefits
✅ Designed specifically for Cummins X15 aftertreatment systems
✅ Supports effective NOx reduction through SCR chemistry
✅ Helps maintain stable aftertreatment system operation
✅ Direct-fit replacement with no modifications required
✅ Built to handle demanding heavy-duty operating conditions

Applications
This SCR unit is intended for heavy-duty trucks and commercial vehicles equipped with Cummins X15 engines produced between 2018 and 2021. Typical applications include long-haul tractors, regional transport vehicles, and vocational trucks where regulated emissions control and reliable aftertreatment operation are essential.

Installation Notes
Allow the exhaust and aftertreatment system to cool completely before servicing. When removing the existing SCR unit, inspect nearby sensors, DEF injector lines, wiring, and mounting hardware for wear or contamination. Install the replacement SCR assembly using proper seals and fasteners to ensure correct alignment. After installation, clear any stored fault codes and confirm correct system operation using appropriate diagnostic tools.

Final Thoughts
If your Cummins X15-equipped vehicle is experiencing emissions warnings or reduced NOx control effectiveness, replacing the SCR assembly with the correct OEM-specified unit can help restore proper aftertreatment function. The Cummins X15 SCR (OEM 5418501) plays a central role in meeting emissions requirements and supporting dependable vehicle operation.