Cummins ISX DOC

Restore Dependable Exhaust Control with the Cummins ISX DOC

What is it?
The Diesel Oxidation Catalyst (DOC) for the Cummins ISX engine is a vital emissions-control component. It converts hydrocarbons (HC) and carbon monoxide (CO) in the exhaust stream into cleaner, less harmful gases, supporting the aftertreatment system’s smooth and reliable operation.

Why choose this DOC?
Designed specifically for ISX engine applications, this DOC delivers proper fitment and dependable emissions support. A worn or restricted catalyst can lead to increased exhaust restriction, more frequent regeneration events, or emissions-related fault codes. Installing the correct DOC helps restore clean exhaust flow and steady system performance. 

Key Benefits
✅ Direct-fit compatibility with Cummins ISX engine platforms.
✅ Converts HC and CO into cleaner exhaust output.
✅ Maintains proper exhaust-gas flow characteristics for downstream aftertreatment components.
✅ Helps reduce restriction in the exhaust path and supports system stability. 
✅ Built for heavy-duty, high-temperature environments and designed with durable construction. 

Applications
Ideal for heavy-duty trucks, long-haul equipment and other vehicles powered by the Cummins ISX engine family—particularly where stringent emissions control and reliable system performance are essential.

Installation Notes
Ensure the exhaust and aftertreatment system has fully cooled before beginning service. Inspect the DOC housing and neighboring exhaust hardware for soot accumulation, damage or leaks. Install new clamps, gaskets and seals as needed. After installation, clear any emissions-system fault codes and verify proper exhaust system behavior via diagnostic tools.

Final Thoughts
If your ISX-equipped vehicle is showing signs of elevated exhaust restriction, emissions alerts or inconsistent aftertreatment system behavior, replacing the DOC with a correct-fit, high-quality unit is a practical way to restore clean, reliable exhaust flow. This component supports the integrity of your emissions-control chain and helps keep your equipment operating as intended.