Cummins X15 SCR 2018-2024: OEM 5418539

Integrated NOx Reduction Module for Cummins X15 Engines (2018–2024)

What is it?
The Cummins X15 SCR (Selective Catalytic Reduction) assembly, referenced by OEM part number 5418539, is an emissions aftertreatment component designed for Cummins X15 diesel engines produced from 2018 through 2024. Operating with Diesel Exhaust Fluid (DEF), the SCR unit helps convert nitrogen oxides (NOx) in the exhaust into harmless nitrogen and water before the gases exit the aftertreatment system, supporting regulatory emissions requirements.

Why choose this SCR Assembly?
This SCR module is engineered to meet Cummins’ original specifications for the X15 platform, ensuring accurate fitment and dependable interaction with DEF injection systems, exhaust sensors, and the engine’s control strategy. When an SCR component becomes less effective due to age, contamination, or extended use, its ability to manage NOx can diminish and lead to emissions alerts or inconsistent aftertreatment performance. Installing the correct OEM-specified SCR helps maintain coordinated exhaust treatment and smoother emissions behavior.

Key Benefits
✅ Designed specifically for Cummins X15 aftertreatment systems (2018–2024)
✅ Helps sustain effective NOx conversion with DEF chemistry
✅ Supports coordinated operation with related emissions components
✅ Direct-fit replacement — no modifications required
✅ Constructed to withstand heavy-duty exhaust environments

Applications
This SCR assembly is suitable for medium- and heavy-duty vehicles equipped with Cummins X15 engines manufactured between 2018 and 2024. It’s commonly used in long-haul tractors, regional transport rigs, vocational work trucks, and other commercial platforms where emissions control and regulatory compliance are essential.

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

Final Thoughts
If your Cummins X15-equipped vehicle is showing NOx-related warnings, fluctuating emissions readings, or irregular aftertreatment behavior, replacing the SCR assembly with the correct OEM-specified part can help restore coordinated emissions control. The Cummins X15 SCR (OEM 5418539) plays an essential role in regulating exhaust chemistry and supporting dependable vehicle operation over demanding duty cycles.