Cummins ISX DOC : OEM 4329543RX

Durable DOC Replacement for Cummins ISX Engines

What Is It?

The Cummins ISX DOC (OEM 4329543RX) is a Diesel Oxidation Catalyst designed to reduce harmful hydrocarbons and carbon monoxide from the exhaust stream of Cummins ISX engines. Installed upstream of the DPF, the DOC plays a critical role in the aftertreatment system by supporting clean combustion and initiating regeneration cycles.

Why Choose OEM 4329543RX?

This DOC is built to Cummins' original engineering standards and is a direct-fit replacement for the factory unit. Using the OEM 4329543RX ensures proper emissions processing, compatibility with sensors, and trouble-free integration with existing exhaust systems—supporting long-term emissions compliance and system reliability.

Key Benefits

✅ Engineered for Cummins ISX: Direct-fit solution for ISX engines requiring DOC replacement
✅ Reduces Emissions Effectively: Helps convert carbon monoxide and hydrocarbons into CO₂ and water vapor
✅ Supports DPF Regeneration: Maintains optimal exhaust temperature for soot burn-off
✅ Rugged Construction: Built to withstand high heat and extended service intervals
✅ Sensor-Ready Design: Includes ports for OEM temperature and pressure sensors

Applications

Ideal for commercial trucks, heavy-duty vocational vehicles, and fleet equipment powered by Cummins ISX engines. This DOC is used in on-highway emissions systems that require consistent oxidation and regulatory compliance.

Installation Notes

Professional installation is recommended. Inspect mounting hardware and nearby sensors during replacement. After installation, ensure the ECM recognizes the new DOC and that no fault codes remain active. A system check and possible forced regen may be needed to confirm full functionality.

Final Thoughts

The Cummins ISX DOC OEM 4329543RX is a dependable emissions component that helps restore clean exhaust flow and supports proper aftertreatment system function. With OEM-grade materials and fitment, it’s a reliable choice for keeping your ISX engine compliant and operational.