Cummins ISX DOC

Clean-Flow Exhaust for Cummins ISX Engines

What is it?
The Diesel Oxidation Catalyst (DOC) tailored for the Cummins ISX engine is a key emissions-control component. It helps convert hydrocarbons (HC) and carbon monoxide (CO) in the exhaust stream into cleaner, less harmful gases, supporting the after-treatment system in maintaining reliable operation.

Why choose this DOC?
This DOC is engineered specifically for ISX engine platforms, ensuring correct fitment and consistent system compatibility. When a DOC becomes worn, clogged, or inefficient, the exhaust system may experience higher restriction, frequent regeneration events, or emissions-related fault codes. Installing the right DOC helps restore clean exhaust flow and stable system performance. 

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
✅ Constructed for heavy-duty, high-temperature operating conditions

Applications
Ideal for heavy-duty trucks, long-haul tractors, vocational equipment, and other applications powered by Cummins ISX engines—especially where emissions control and dependable system operation are essential.

Installation Notes
Before servicing, allow the exhaust system and after-treatment components to cool fully. Inspect the DOC housing and connected exhaust hardware for soot accumulation, cracking, or damage. Replace clamps, gaskets, and seals with new parts during installation. After installation, clear any emissions-system fault codes and verify proper exhaust system behavior using 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 the correct application-specific unit is a practical and effective way to restore clean, reliable exhaust flow. This component plays a vital role in maintaining the integrity of your emissions-control system and supporting dependable equipment operation.