Exhaust Conversion Catalyst for Cummins ISX Engines (2011–2013)
What is it?
The Cummins ISX DOC (Diesel Oxidation Catalyst) for model years 2011–2013 transforms carbon monoxide (CO) and unburned hydrocarbons (HC) in the exhaust into less harmful substances before they reach downstream aftertreatment stages.
Why choose this DOC?
Purpose-built for ISX engines from 2011 to 2013, this DOC maintains high conversion efficiency without unduly restricting exhaust flow. Using the correct unit helps protect downstream systems, reduce backpressure problems, and avoid error codes caused by incompatible or low-grade parts.
Key Benefits
✅ Designed for Cummins ISX engines (2011–2013)
✅ Converts CO and HC gases into safer byproducts
✅ Supports downstream particulate filters or SCR systems
✅ Robust design to withstand high exhaust temperatures
✅ Direct-fit construction ensures proper installation
Applications
This DOC is ideal for heavy trucks, on-road freight rigs, and machinery powered by Cummins ISX engines built between 2011 and 2013. It functions as the first catalytic stage before further exhaust treatment.
Installation Notes
Start with a cooled engine and exhaust. Drain or disconnect necessary components to remove the old DOC. Inspect mounting surfaces, flanges, pipes, and seals for wear. Install the new DOC using fresh gaskets, torque all fasteners to Cummins specs, and confirm a proper seal. After installation, monitor exhaust diagnostics or run a drive cycle to confirm proper function.
Final Thoughts
For Cummins ISX engines from 2011 to 2013, this DOC provides the right balance of conversion performance, longevity, and system compatibility—helping maintain emission compliance and stable exhaust behavior.