Cummins ISX DOC

Precision Exhaust Filtration for Cummins ISX Engines

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

Why choose this DOC?
Developed specifically for ISX engine platforms, this DOC offers correct fitment and dependable emissions-system performance. If a catalyst becomes worn, blocked or inefficient, you may experience increased exhaust resistance, frequent regeneration cycles, or emissions-related fault codes. Installing the proper DOC helps maintain clean exhaust flow and consistent 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 tractors, vocational trucks and other equipment powered by Cummins ISX engines—especially where emissions compliance and consistent system behavior are critical.

Installation Notes
Ensure the exhaust system and after-treatment components are completely cooled before service. Inspect the DOC housing and adjoining exhaust hardware for soot accumulation, cracks or damage. Replace 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 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 is vital in maintaining the integrity of the emissions-control system and supporting dependable operation.