Cummins ISB 6.7 DOC

Direct-Fit DOC Solution for the Cummins ISB 6.7 Engine

What is it?
The Diesel Oxidation Catalyst (DOC) for the Cummins ISB 6.7 engine is an essential emissions-control component. It oxidizes hydrocarbons (HC) and carbon monoxide (CO) in the exhaust stream into cleaner, less harmful gases, supporting the aftertreatment system’s reliable function.

Why choose this DOC?
Tailored specifically for the ISB 6.7 engine (2014-2017), this DOC delivers precise fitment and dependable emissions control. A worn or obstructed catalyst can lead to increased exhaust restriction, repeated regeneration cycles, or emissions fault codes. Installing the correct DOC helps maintain clean exhaust flow and consistent system behavior.

Key Benefits
✅ Converts HC and CO into cleaner exhaust output
✅ Maintains proper exhaust-gas flow for downstream aftertreatment components
✅ Helps reduce exhaust restriction and support stable system operation
✅ Direct-fit design requiring no modifications
✅ Built to endure high-temperature, heavy-duty environment conditions

Applications
Ideal for use in medium-duty trucks, vocational vehicles, buses and other equipment equipped with the Cummins ISB 6.7 engine (2014-2017 model years), especially where emissions control and reliable operation are required.

Installation Notes
Allow the exhaust and aftertreatment system to cool completely before beginning service. Inspect the DOC housing and adjacent hardware for buildup, damage or leaks. Replace clamps, gaskets, and seals with new components during installation. After fitting the DOC, clear any emissions system fault codes and verify proper exhaust system behavior using diagnostic checks.

Final Thoughts
If your ISB 6.7-equipped vehicle is experiencing emissions warnings, elevated exhaust restriction, or inconsistent aftertreatment function, replacing the DOC with a direct-fit, application-specific unit offers a practical route to restore clean, consistent exhaust flow and dependable emissions system operation.