Cummins ISB 6.7L DOC 2013-2017: OEM 4353324

Support Cleaner Exhaust Operation with a DOC for Cummins ISB 6.7L Engines

What is it?
The Cummins ISB 6.7L Diesel Oxidation Catalyst (DOC), identified by OEM 4353324, is an emissions aftertreatment component designed for Cummins ISB 6.7L engines produced between 2013 and 2017. Positioned within the exhaust system, the DOC helps initiate the emissions treatment process by oxidizing hydrocarbons and carbon monoxide before exhaust gases move through downstream aftertreatment components.

Why choose this DOC Assembly?
Modern diesel emissions systems depend on properly functioning catalyst components to maintain efficient exhaust treatment and reliable system performance. This DOC assembly is manufactured to match Cummins ISB 6.7L specifications, ensuring compatibility with factory-installed sensors, DPF components, and exhaust connections. Over time, catalyst efficiency can decrease due to soot accumulation, contamination, and prolonged exposure to high exhaust temperatures. Replacing the unit with the correct OEM-matched DOC helps maintain proper exhaust flow and consistent aftertreatment operation.

Key Benefits
✅ Designed for Cummins ISB 6.7L engines (2013–2017)
✅ Supports the initial stage of the emissions treatment process
✅ Helps maintain proper exhaust flow through the aftertreatment system
✅ Direct-fit replacement for accurate installation
✅ Built to withstand demanding high-temperature diesel environments

Applications
This DOC assembly is used on medium-duty trucks, buses, commercial vehicles, and vocational equipment equipped with Cummins ISB 6.7L engines from 2013 through 2017. Common applications include delivery trucks, service vehicles, municipal fleets, and other diesel-powered platforms where dependable emissions control is essential.

Installation Notes
Before installation, allow the exhaust and aftertreatment system to cool completely. Remove the existing DOC assembly and inspect surrounding sensors, clamps, gaskets, and exhaust connections for wear or contamination. Install the replacement component using proper mounting hardware and sealing components to ensure correct alignment and leak-free operation. After installation, verify proper aftertreatment functionality and clear any stored fault codes using diagnostic equipment.

Final Thoughts
If your Cummins ISB 6.7L-powered vehicle is experiencing emissions-related warnings, reduced catalyst efficiency, or inconsistent aftertreatment performance, replacing the DOC assembly with the correct OEM component can help maintain proper exhaust treatment. The Cummins ISB 6.7L DOC (OEM 4353324) plays an important role in supporting reliable emissions control, efficient exhaust processing, and dependable vehicle operation.