Cummins X15 SCR 2018-2021: OEM 5418537

Optimized NOx Control for Cummins X15 Engines (2018–2021)

What is it?
The Cummins X15 SCR (Selective Catalytic Reduction) assembly with OEM part number 5418537 is an emissions aftertreatment component made for Cummins X15 diesel engines built between 2018 and 2021. Working with Diesel Exhaust Fluid (DEF), this SCR unit supports a chemical process that transforms nitrogen oxides (NOx) in the exhaust into safe nitrogen and water before the gases exit the system, helping the vehicle meet regulated emissions standards.

Why choose this SCR Assembly?
This SCR module is built to Cummins’ original specifications for the X15 platform, ensuring a precise fit and reliable integration with DEF injectors, exhaust sensors, and the engine’s control systems. When an SCR unit becomes less efficient due to age or contamination, NOx conversion performance can deteriorate, potentially leading to system warnings or unpredictable emissions behavior. Installing the correct OEM-specified assembly helps sustain stable NOx conversion and coordinated aftertreatment performance.

Key Benefits
✅ Designed specifically for Cummins X15 aftertreatment layouts (2018–2021)
✅ Supports dependable reduction of nitrogen oxides with DEF interaction
✅ Helps maintain coordinated operation with related emissions components
✅ Direct-fit replacement — no adjustments required
✅ Built to withstand heavy-duty exhaust environments and prolonged use

Applications
This SCR assembly is ideal for medium- and heavy-duty vehicles equipped with Cummins X15 engines manufactured between 2018 and 2021. It’s commonly used in long-haul tractors, regional transport rigs, vocational trucks, and other commercial platforms where consistent emissions control and regulatory compliance are essential.

Installation Notes
Ensure the exhaust and aftertreatment system has fully cooled before beginning service. Remove the existing SCR module and inspect adjacent DEF lines, sensors, and mounting hardware for signs of wear or contamination. 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 aftertreatment behavior with appropriate diagnostics.

Final Thoughts
If your Cummins X15-powered vehicle is experiencing NOx-related alerts, fluctuating emissions readings, or inconsistent aftertreatment responses, replacing the SCR module with the correct OEM-specified part can help restore balanced emissions control. The Cummins X15 SCR (OEM 5418537) plays a key role in managing regulated exhaust chemistry and supporting dependable operation across demanding duty cycles.