Paccar PX7, PX9 SCR 2018-2024: OEM 5418530

Integrated NOx Reduction Module for Paccar PX-Series Engines (2018–2024)

What is it?
The Paccar PX7/PX9 SCR (Selective Catalytic Reduction) assembly, identified by OEM part number 5418530, is an emissions aftertreatment component designed for Paccar PX7 and PX9 diesel engines manufactured between 2018 and 2024. It works with Diesel Exhaust Fluid (DEF) to support a chemical reaction that converts nitrogen oxides (NOx) in the exhaust into harmless nitrogen and water before the gases exit the system, helping the engine meet regulated emissions standards.

Why choose this SCR Assembly?
This SCR module is engineered to match Paccar’s original specifications for the PX7 and PX9 platforms, ensuring precise fitment and seamless integration with DEF dosing hardware, emissions sensors, and engine control systems. When SCR components lose efficiency or become compromised, NOx conversion performance can diminish and may trigger emissions alerts or uneven aftertreatment behavior. Using the correct OEM-specified unit helps maintain consistent emissions control and coordinated system responses.

Key Benefits
✅ Tailored for Paccar PX7 and PX9 aftertreatment systems (2018–2024)
✅ Helps sustain dependable NOx conversion using DEF chemistry
✅ Supports coordinated operation with related emissions components
✅ Direct-fit replacement — no modifications required
✅ Built to handle heavy-duty exhaust environments

Applications
This SCR assembly is suitable for medium- and heavy-duty trucks and commercial vehicles powered by Paccar PX7 and PX9 diesel engines built from 2018 through 2024. It is commonly found in over-the-road tractors, regional hauling units, vocational trucks, and other equipment where dependable emissions management and regulatory compliance are essential.

Installation Notes
Before servicing, allow the exhaust and aftertreatment system to cool completely. Remove the existing SCR module and inspect nearby DEF lines, sensors, and mounting hardware for signs of 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 appropriate diagnostic tools.

Final Thoughts
If your Paccar PX7 or PX9-equipped vehicle is showing NOx-related warnings, inconsistent emissions behavior, or irregular aftertreatment responses, replacing the SCR unit with the correct OEM-specified component can help restore coordinated emissions control. The Paccar PX7/PX9 SCR (OEM 5418530) plays a central role in regulating exhaust chemistry and supporting dependable operation across demanding duty cycles.