Restore Clean Exhaust Function with Cummins X12 X15 DOC
What is it?
The Diesel Oxidation Catalyst (DOC) for the Cummins X12 and X15 engine series is an essential after-treatment component. It oxidizes hydrocarbons (HC) and carbon monoxide (CO) in the exhaust stream, preparing gases for downstream treatment and helping maintain system efficiency.
Why choose this DOC?
Designed specifically for Cummins X12 and X15 engines, this DOC ensures correct fitment and reliable emissions control. A damaged or inefficient DOC can lead to restricted flow, elevated back-pressure, frequent regeneration attempts, or fault codes. Replacing it restores system balance and supports lasting performance.
Key Benefits
✅ Converts harmful exhaust gases into safer emissions
✅ Supports efficient downstream treatment and system balance
✅ Helps lower back-pressure and improves exhaust flow
✅ Direct-fit replacement—no modifications required
✅ Built to meet heavy-duty operating conditions and durability standards
Applications
Ideal for trucks and equipment equipped with Cummins X12 or X15 engines, where emissions control, efficiency, and compliance are critical.
Installation Notes
Allow the exhaust system to cool before beginning. Inspect the DOC housing and connections for wear or damage. Replace gaskets, clamps, and seals as needed. Once installed, clear any fault codes and monitor exhaust system diagnostics to confirm proper function.
Final Thoughts
If your vehicle is showing signs of emissions system inefficiency—such as frequent regenerations, faults, or reduced exhaust flow—installing the correct DOC for your Cummins engine is essential. It restores clean operation, enhances performance, and supports long-term reliability.