Cummins X15 SCR 2018-2021: OEM 5418543

Reliable NOx Conversion for Cummins X15 Engines (2018–2021)

What is it?
The Cummins X15 SCR (Selective Catalytic Reduction) assembly with OEM part number 5418543 is an emissions aftertreatment component designed for Cummins X15 diesel engines manufactured between 2018 and 2021. Operating with Diesel Exhaust Fluid (DEF), this unit supports a chemical reaction that turns nitrogen oxides (NOx) in the exhaust into harmless nitrogen and water before the gases exit the aftertreatment system, helping the engine meet emissions standards.

Why choose this SCR Assembly?
This SCR module is made to match Cummins’ original specifications for the X15 platform, ensuring proper fit and seamless integration with DEF dosing hardware, emissions sensors, and engine control systems. As components age, SCR performance can decrease, which may affect NOx reduction efficiency and trigger system warnings. Using the correct OEM-specified SCR helps maintain dependable emissions behavior and coordinated aftertreatment operation.

Key Benefits
✅ Designed specifically for Cummins X15 aftertreatment systems (2018–2021)
✅ Supports reliable NOx conversion with DEF interaction
✅ Helps sustain coordinated function with related emissions components
✅ Direct-fit replacement — no modifications required
✅ Built for durability under heavy-duty exhaust conditions

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

Installation Notes
Before servicing, make sure the exhaust and aftertreatment system has completely cooled. Remove the existing SCR module and inspect nearby DEF lines, sensors, and mounting hardware for soot buildup, wear, 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 performance using diagnostic tools.

Final Thoughts
If your Cummins X15-equipped vehicle is experiencing emissions alerts, fluctuating NOx readings, or inconsistent aftertreatment behavior, replacing the SCR assembly with the correct OEM-specified part can help restore smoother emissions control. The Cummins X15 SCR (OEM 5418543) plays a key role in managing regulated exhaust chemistry and supporting dependable vehicle operation across demanding duty cycles.