Cummins ISB DOC

A Cleaner Exhaust Solution for Your Cummins ISB Engine

What is it?
The Diesel Oxidation Catalyst (DOC) designed for the Cummins ISB engine is a fundamental emissions-control component. It works by converting hydrocarbons (HC) and carbon monoxide (CO) in the exhaust stream into cleaner, less harmful gases, allowing the emissions system to operate smoothly and consistently.

Why choose this DOC?
Built specifically for the Cummins ISB engine family, this DOC provides accurate fitment and dependable emissions function. When the catalyst becomes worn or obstructed, you may notice increased exhaust restriction, repeated regeneration events, or emissions-related fault codes. Installing the correct DOC helps maintain clean exhaust flow and stable overall system behavior.

Key Benefits
✅ Converts HC and CO into cleaner exhaust output
✅ Supports downstream aftertreatment components
✅ Helps maintain stable exhaust flow and reduce restriction
✅ Direct-fit design requiring no modifications
✅ Durable construction suited for high-temperature, heavy-duty environments

Applications
Well-suited for medium-duty trucks, vocational vehicles, buses, and other equipment powered by Cummins ISB engines. This DOC is ideal for operations that depend on consistent emissions control and reliable system performance throughout daily use.

Installation Notes
Ensure the exhaust system is completely cool before starting service. Inspect the DOC housing and surrounding components for soot accumulation, cracks, or other damage. Always install new clamps, gaskets, and seals during replacement. After installation, clear any emissions codes and confirm proper system behavior through diagnostic checks.

Final Thoughts
If your ISB-equipped vehicle or equipment is experiencing emissions warnings, rising exhaust restriction, or irregular aftertreatment activity, replacing the DOC is a practical way to restore clean, consistent exhaust flow. This component supports dependable operation and helps keep your emissions system functioning as designed.