Cummins X15 SCR 2018-2021: OEM 5418501

Advanced NOx Reduction System for Cummins X15 Engines (2018–2021)

What is it?
The Cummins X15 SCR (Selective Catalytic Reduction) unit, built for 2018–2021 engines with OEM part number 5418501, is a core emissions aftertreatment component. It works by using Diesel Exhaust Fluid (DEF) to chemically convert oxides of nitrogen (NOx) in the exhaust into harmless nitrogen and water, helping the engine meet stringent emissions standards.

Why choose this SCR Assembly?
This SCR unit is manufactured to Cummins’ original specifications for X15 applications, ensuring accurate fitment and reliable interaction with the engine’s aftertreatment sensors and control systems. When an SCR component is compromised or out of spec, NOx conversion efficiency can diminish and emissions alerts may occur. Selecting the correct OEM unit helps maintain coordinated emissions control behavior and system stability.

Key Benefits
✅ Designed specifically for Cummins X15 aftertreatment architecture
✅ Facilitates effective reduction of NOx emissions via SCR chemistry
✅ Supports consistent aftertreatment system operation
✅ Direct-fit installation — no modifications required
✅ Built to handle the challenges of heavy-duty exhaust environments

Applications
This SCR assembly is ideal for heavy-duty trucks and commercial vehicles powered by Cummins X15 engines produced between 2018 and 2021. It is commonly used in long-haul transport, regional freight operations, vocational vehicles, and other applications where dependable emissions control and regulatory compliance are essential.

Installation Notes
Before service, allow the exhaust and aftertreatment system to cool completely. Remove the existing SCR unit and inspect surrounding sensor lines, DEF injector connections, and mounting hardware for contamination, wear, or damage. Install the new SCR assembly with appropriate seals and fasteners to ensure correct alignment and airtight sealing. After installation, clear any stored fault codes and verify proper system response using diagnostic tools.

Final Thoughts
If your Cummins X15-equipped vehicle is showing NOx-related warnings or reduced emissions control effectiveness, installing the correct OEM SCR assembly can help restore coordinated NOx reduction and dependable aftertreatment function. The Cummins X15 SCR (OEM 5418501) is a key component in maintaining emissions system balance and supporting reliable engine use.