Cummins ISX DOC

Support Reliable Emissions Control with the Cummins ISX DOC

What is it?
The Diesel Oxidation Catalyst (DOC) for the Cummins ISX engine is a critical emissions-control component. It converts hydrocarbons (HC) and carbon monoxide (CO) in the exhaust stream into cleaner, less harmful gases, helping ensure that the after-treatment system continues to operate smoothly and dependably.

Why choose this DOC?
Designed specifically for the Cummins ISX series, this DOC provides proper fitment and dependable emissions performance. A worn or blocked catalyst may lead to higher exhaust restriction, frequent regeneration cycles, or emissions-related fault codes. Installing the correct DOC helps maintain clean exhaust flow and stable system behavior.

Key Benefits
✅ Converts HC and CO into cleaner exhaust output
✅ Supports the function of downstream after-treatment components
✅ Helps maintain steady exhaust flow and reduce restriction
✅ Direct-fit design—no modifications required
✅ Built for heavy-duty, high-temperature operating environments 

Applications
Ideal for heavy-duty trucks, vocational equipment and other applications powered by Cummins ISX engines. It is especially useful where emissions compliance and reliable system behavior are essential.

Installation Notes
Ensure the exhaust and after-treatment system has cooled completely before beginning service. Inspect the DOC housing and surrounding exhaust components for buildup, damage or leaks. Use new clamps, gaskets and seals during replacement. After installation, clear any emissions-system fault codes and verify proper exhaust system flow and behavior through diagnostics. 

Final Thoughts
If your ISX-equipped vehicle is showing signs of elevated exhaust restriction, emissions warnings or inconsistent after-treatment system behavior, replacing the DOC with a correctly matched unit is a practical way to restore clean, reliable exhaust flow. This component plays a crucial role in maintaining the integrity of the full emissions-control chain and supporting dependable operation.