Cummins ISX DOC

Support Your ISX Emissions System with a Quality DOC

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

Why choose this DOC?
Engineered specifically for the ISX engine series, this DOC offers correct fitment and dependable emissions handling. When a DOC becomes worn or blocked, you may experience elevated exhaust restriction, frequent regenerations, or emissions-related fault codes. Installing the proper DOC helps support clean exhaust flow and consistent system performance.

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

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

Installation Notes
Before servicing, ensure the exhaust system and aftertreatment components are fully cooled. Inspect the DOC housing and surrounding exhaust hardware for soot accumulation, damage or leaks. Install new clamps, gaskets and seals during replacement. After installing, clear any emissions fault codes and verify proper exhaust system behaviour via diagnostics.

Final Thoughts
If your ISX-equipped vehicle is showing signs of increased exhaust restriction, emissions warnings or inconsistent aftertreatment system behaviour, replacing the DOC with a correctly matched unit is a practical way to restore clean, reliable exhaust flow. This component supports dependable system operation and helps maintain your equipment’s emissions-control integrity.