Paccar PX6 DPF

Precision Emissions Support 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) in the exhaust stream into cleaner, less harmful gases, supporting the after-treatment system’s reliable operation.

Why choose this DOC?
Designed specifically for ISX engine applications, this DOC offers correct fitment and dependable system support. If a catalyst becomes worn, blocked or inefficient, the exhaust system may experience increased exhaust restriction, more frequent regeneration cycles, or fault codes tied to emissions control. 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 trucks, long-haul equipment and other vehicles powered by the Cummins ISX engine family—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 correct 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 plays a vital role in maintaining the integrity of the emissions-control system and supporting dependable operation.