Cummins B6.7, L9 SCR 2018-2024: OEM 5418535

Comprehensive NOx Management Module for Cummins B6.7 & L9 Engines (2018–2024)

What is it?
The Cummins B6.7/L9 SCR (Selective Catalytic Reduction) assembly, identified by OEM 5418535, is an emissions aftertreatment module designed for use on Cummins B6.7 and L9 engines produced from 2018 through 2024. It works together with Diesel Exhaust Fluid (DEF) to support a chemical process that converts nitrogen oxides (NOx) in the exhaust into nitrogen and water before the gases exit the aftertreatment system, aiding in regulated emissions control.

Why choose this SCR Assembly?
This SCR module is built to meet Cummins’ original design specifications for both the B6.7 and L9 platforms, ensuring a precise fit and reliable integration with DEF metering components, exhaust sensors, and control systems. When an SCR component becomes less effective due to age, contamination, or normal wear, NOx reduction efficiency can diminish and may lead to emissions alerts or irregular system behavior. Selecting the correct OEM-specified assembly helps maintain coordinated exhaust treatment and more consistent emissions performance.

Key Benefits
✅ Designed for Cummins B6.7 and L9 aftertreatment systems (2018–2024)
✅ Promotes reliable NOx conversion through DEF interaction
✅ Supports coordinated operation across emissions components
✅ Direct-fit replacement — no fabrication or adjustments required
✅ Constructed to withstand demanding exhaust environments

Applications
This SCR assembly is suited for medium- and heavy-duty trucks and commercial vehicles equipped with Cummins B6.7 or L9 engines manufactured between 2018 and 2024. It’s a dependable choice for delivery fleets, vocational rigs, regional transport vehicles, and other commercial platforms where regulated emissions performance is a core operational requirement.

Installation Notes
Before performing service, allow the exhaust and aftertreatment system to cool completely. Remove the existing SCR module and inspect surrounding DEF lines, sensors, and mounting hardware for signs of soot buildup or wear. Install the replacement SCR assembly using the proper seals and fasteners to ensure a secure, leak-free fit. After installation, clear any stored fault codes and verify correct aftertreatment behavior using diagnostic tools.

Final Thoughts
If your Cummins B6.7- or L9-equipped vehicle is showing uneven NOx readings, emissions warnings, or inconsistent exhaust behavior, installing the correct OEM SCR assembly can help restore coordinated aftertreatment performance. The Cummins B6.7/L9 SCR (OEM 5418535) plays an essential role in managing regulated exhaust chemistry and supporting dependable vehicle operation across a wide range of duty cycles.