Navistar DOC : OEM 2604039C91

Reliable Emissions Control for Navistar Diesel Platforms

What Is It?

The Navistar Diesel Oxidation Catalyst (DOC) OEM 2604039C91 is a direct-fit replacement component that serves as the initial stage of exhaust treatment in Navistar diesel engines. Its purpose is to oxidize harmful gases—specifically hydrocarbons (HC) and carbon monoxide (CO)—into less harmful byproducts before they move through the emissions system.

Why Choose OEM 2604039C91?

This DOC is built to meet Navistar’s original equipment standards, ensuring proper fit, long-term durability, and compatibility with your vehicle’s emissions and aftertreatment systems. It helps create the exhaust environment needed for efficient downstream filtration and soot management.

Key Benefits

✅ OEM-Specific Fitment: Made to integrate directly with Navistar diesel systems
✅ Reduces HC and CO: Promotes oxidation of harmful gases into less hazardous emissions
✅ Supports Regeneration Conditions: Helps maintain necessary exhaust temperatures for DPF function
✅ Durable Construction: Built to withstand high thermal loads and continuous duty cycles
✅ Sensor-Ready Design: Fully compatible with factory pressure and temperature sensors

Applications

Commonly used in Navistar trucks and buses, including medium-duty and heavy-duty commercial vehicles. Ideal for operations in emissions-regulated regions where reliable DOC functionality is essential for vehicle uptime and compliance.

Installation Notes

Have a certified technician complete the installation. Inspect all gaskets, clamps, and sensor ports before fitting the new unit. Once installed, clear ECM fault codes, reset emissions tracking values, and verify readiness for regeneration using diagnostic tools.

Final Thoughts

The OEM 2604039C91 DOC offers the quality and dependability needed to restore emissions system integrity in Navistar diesel vehicles. With its factory-grade compatibility and thermal resilience, it’s an excellent choice for maintaining compliance and avoiding downtime.