Cummins ISB 6.7L SCR Outlet Catalyst Module 2014-2017: OEM 4354223

Steady Emissions Treatment for Cummins ISB 6.7L Engines (2014–2017)

What is it?
The Cummins ISB 6.7L SCR Outlet Catalyst Module, identified by OEM 4354223, is an important component of the Selective Catalytic Reduction (SCR) aftertreatment system. It works with Diesel Exhaust Fluid (DEF) to help convert nitrogen oxide (NOx) emissions into nitrogen and water vapor before treated exhaust leaves the system. As part of the outlet stage, this module helps complete the SCR process and maintain consistent emissions treatment.

Why choose this SCR Outlet Catalyst Module?
Effective SCR operation depends on proper DEF dosing, controlled exhaust temperatures, and reliable catalyst activity. The OEM 4354223 SCR Outlet Catalyst Module is designed for Cummins ISB 6.7L applications from 2014 through 2017, helping maintain compatibility with surrounding factory aftertreatment components.

Repeated exposure to high exhaust temperatures, DEF deposits, contaminants, and demanding operating cycles can gradually affect catalyst efficiency. When the module becomes damaged or less effective, operators may encounter emissions warning lights, elevated NOx readings, diagnostic fault codes, or derate conditions.

Choosing the correct OEM-matched catalyst module helps restore proper exhaust treatment while maintaining the fit and connections required by the existing SCR system.

Key Benefits
✅ OEM-matched SCR Outlet Catalyst Module for Cummins ISB 6.7L engines (2014–2017)
✅ Supports effective nitrogen oxide (NOx) reduction
✅ Works with DEF to support proper SCR system operation
✅ Helps maintain consistent exhaust treatment through the outlet stage
✅ Supports dependable aftertreatment system function
✅ Direct-fit design for straightforward installation

Applications
This SCR Outlet Catalyst Module is designed for Cummins ISB 6.7L diesel engine applications from 2014 through 2017. These engines are commonly used in medium-duty trucks, buses, delivery vehicles, vocational equipment, and commercial fleet applications equipped with SCR aftertreatment systems. Confirm OEM number 4354223 and vehicle-specific fitment information before installation.

Installation Notes
Allow the exhaust system to cool completely before beginning installation. Inspect the DEF injector, NOx sensors, temperature sensors, exhaust connections, clamps, seals, and mounting hardware for contamination, wear, or damage. Install the replacement catalyst module using the correct seals and hardware to ensure proper alignment and secure connections. After installation, inspect for exhaust leaks, clear applicable diagnostic codes, and verify SCR system operation using appropriate diagnostic equipment.

Final Thoughts
Consistent outlet catalyst operation is essential for completing the SCR emissions treatment process. The Cummins ISB 6.7L SCR Outlet Catalyst Module (OEM 4354223) helps maintain effective NOx treatment, reliable exhaust processing, and dependable aftertreatment system operation for 2014–2017 applications.