Cummins ISB 6.7 DOC

Restore Reliable Exhaust Flow with the Cummins ISB 6.7 DOC

What is it?
The Diesel Oxidation Catalyst (DOC) for the Cummins ISB 6.7 engine is a key emissions-control component. It converts hydrocarbons (HC) and carbon monoxide (CO) in the exhaust stream into cleaner, less harmful gases, helping the aftertreatment system operate smoothly and reliably. 

Why choose this DOC?
Designed specifically for the ISB 6.7 engine model, this DOC delivers accurate fitment and dependable emissions control. When the catalyst becomes worn or clogged, you may see increased exhaust restriction, frequent regeneration events, or fault codes tied to emissions control. Installing the correct DOC helps support clean exhaust flow and consistent system performance. 

Key Benefits
✅ Converts HC and CO into cleaner exhaust output
✅ Supports downstream aftertreatment components and system integrity
✅ Helps maintain steady exhaust flow and reduce restrictive build-up
✅ Direct-fit design—no modifications required
✅ Built for heavy-duty, high-temperature operating conditions

Applications
Ideal for medium-duty trucks, vocational vehicles, buses, and other equipment powered by the Cummins ISB 6.7 engine—especially where emissions compliance and reliable system behavior are essential.

Installation Notes
Allow the exhaust system to cool completely before servicing. Inspect the DOC housing and surrounding hardware for buildup, cracks, or damage. Replace clamps, gaskets, and seals as required. After installation, clear any emissions fault codes and verify proper exhaust system behavior via diagnostic checks.

Final Thoughts
If your ISB 6.7-equipped unit is showing signs of emissions alerts, elevated exhaust restriction, or erratic aftertreatment operation, replacing the DOC with a unit specific to the ISB 6.7 is a smart way to restore clean, dependable exhaust flow. This component supports reliable system function and helps keep your emissions system operating as intended.