Navistar ISX DOC : OEM 4353274

Essential Emissions Control for Navistar ISX Engines

What Is It?

The Navistar Diesel Oxidation Catalyst (DOC) OEM 4353274 is a direct-fit component designed to reduce harmful exhaust gases in diesel vehicles powered by the Cummins ISX engine used in Navistar applications. This DOC is the first stage in the emissions system, where it converts carbon monoxide (CO) and hydrocarbons (HC) into less harmful emissions.

Why Choose OEM 4353274?

Specifically engineered for ISX-powered Navistar vehicles, the 4353274 DOC provides a precise fit, optimal oxidation working conditions, and seamless compatibility with the vehicle’s aftertreatment system. It plays a vital role in supporting downstream DPF function by maintaining the right exhaust conditions for proper regeneration.

Key Benefits

✅ Designed for ISX Engines in Navistar Platforms: Ensures direct-fit integration and emissions system compatibility
✅ Reduces CO and Hydrocarbons: Oxidizes harmful gases before they reach the DPF
✅ Supports Effective DPF Regeneration: Maintains required exhaust temperatures
✅ Rugged OEM Construction: Built to withstand harsh thermal cycles and vibration
✅ Sensor-Compatible: Accepts OEM pressure and temperature sensors

Applications

This DOC is commonly used in heavy-duty Navistar trucks equipped with Cummins ISX engines. It’s ideal for freight, long-haul, vocational, and commercial vehicles requiring a reliable emissions solution to stay compliant and avoid costly downtime.

Installation Notes

Have a professional technician perform the installation. Check all mounting hardware, flanges, and sensors before replacing. After installation, reset ECM parameters using compatible diagnostic tools and confirm readiness for regeneration.

Final Thoughts

The OEM 4353274 DOC offers a dependable solution for restoring emissions efficiency in Navistar vehicles with Cummins ISX engines. Its OEM design, proven durability, and system compatibility make it a smart choice for fleets focused on long-term emissions compliance and reliability.