Cummins X15 SCR 2018-2021: OEM 5418505

Engine-Matched NOx Reduction for Cummins X15 Engines (2018–2021)

What is it?
The Cummins X15 SCR (Selective Catalytic Reduction) assembly for 2018–2021 engines, identified by OEM part number 5418505, is a primary emissions aftertreatment component. It works in tandem with Diesel Exhaust Fluid (DEF) to chemically transform nitrogen oxides (NOx) in the exhaust into harmless nitrogen and water before leaving the system, helping the vehicle meet emissions standards.

Why choose this SCR Assembly?
This SCR unit is built to Cummins’ original design specifications for the X15 platform, ensuring proper integration with sensors, DEF dosing systems, and control modules. When the SCR unit degrades or operates outside of spec, NOx conversion efficiency can decline and trigger alerts or irregular system responses. Choosing the correct OEM-specified SCR helps maintain effective NOx control and coordinated aftertreatment behavior.

Key Benefits
✅ Specifically designed for Cummins X15 emissions systems
✅ Promotes consistent NOx conversion via SCR chemistry
✅ Helps sustain coordinated aftertreatment operation
✅ Direct-fit assembly — no modifications required
✅ Constructed for heavy-duty exhaust conditions

Applications
This SCR assembly is intended for heavy-duty trucks and commercial vehicles equipped with Cummins X15 engines built between 2018 and 2021. It fits long-haul rigs, regional carriers, vocational trucks, and other platforms where dependable NOx reduction and emissions control are required.

Installation Notes
Ensure the exhaust and aftertreatment system has fully cooled before beginning service. Remove the existing SCR module and inspect nearby DEF lines, sensors, hardware, and mounting points for wear or contamination. Install the replacement SCR assembly with proper seals and fasteners to achieve secure, leak-free alignment. After installation, clear any stored system codes and verify correct emissions system operation via diagnostics.

Final Thoughts
If your Cummins X15-equipped vehicle is showing emissions alerts, inconsistent NOx conversion, or other aftertreatment irregularities, installing the correct OEM-specified SCR assembly can help restore effective NOx control. The Cummins X15 SCR (OEM 5418505) plays a key role in keeping emissions management functioning as intended and supporting reliable vehicle operation.