Cummins ISX DOC

Restore Emissions Flow 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, supporting the after-treatment system’s reliable operation.

Why choose this DOC?
Engineered specifically for the ISX engine series, this DOC offers correct fitment and dependable emissions-system support. When a catalyst becomes worn or limited, the exhaust system may suffer increased exhaust restriction, more frequent regeneration cycles, or fault codes tied to emissions. Installing the proper DOC helps re-establish clean exhaust flow and stable system behavior.

Key Benefits
✅ Converts HC and CO into cleaner exhaust output
✅ Supports 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 conditions

Applications
Ideal for heavy-duty trucks, long-haul equipment, and other vehicles powered by the Cummins ISX engine family—especially where emissions compliance and dependable system performance are critical.

Installation Notes
Ensure the exhaust system and after-treatment components are fully cooled before service begins. Inspect the DOC housing and neighboring exhaust hardware for soot accumulation, cracks, or damage. Replace any worn clamps, gaskets and seals with new parts during installation. After installation, clear any emissions-system fault codes and verify proper exhaust system behavior via diagnostic checks.

Final Thoughts
If your ISX-equipped vehicle shows signs of increased 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 key role in maintaining the integrity of the emissions-control system and supporting dependable operation.