Ford Powerstroke 6.4L DOC/DPF 2008-2010: OEM 9C3Z-5H221-B

Protect Your Powerstroke's Emissions System with a DOC/DPF Assembly for 6.4L Engines

What is it?
The Ford Powerstroke 6.4L DOC/DPF assembly, identified by OEM 9C3Z-5H221-B, is an integrated emissions aftertreatment component designed for Ford Powerstroke 6.4L diesel engines produced between 2008 and 2010. Combining the Diesel Oxidation Catalyst (DOC) and Diesel Particulate Filter (DPF) into one assembly, it helps reduce harmful exhaust emissions by oxidizing pollutants and trapping soot before exhaust gases are released. The 6.4L Power Stroke was the first Ford Super Duty diesel engine equipped with a factory DPF system.

Why choose this DOC/DPF Assembly?
A properly functioning DOC/DPF assembly is essential for maintaining efficient exhaust treatment and supporting the engine's regeneration process. This assembly is manufactured to match Ford Powerstroke 6.4L specifications, ensuring compatibility with factory-installed sensors, exhaust piping, and regeneration components. Over time, soot buildup, ash accumulation, repeated regeneration cycles, and catalyst aging can reduce filtration efficiency, potentially resulting in excessive exhaust restriction, reduced regeneration performance, or emissions-related warning lights. Replacing the assembly with the correct OEM-matched component helps maintain dependable aftertreatment operation.

Key Benefits
✅ Designed for Ford Powerstroke 6.4L engines (2008–2010)
✅ Integrates DOC and DPF functions into a single assembly
✅ Helps support efficient soot filtration and exhaust treatment
✅ Direct-fit replacement for accurate installation
✅ Built for durability in demanding diesel truck applications

Applications
This DOC/DPF assembly is used on Ford Super Duty trucks equipped with 6.4L Powerstroke diesel engines from 2008 through 2010. Common applications include F-250, F-350, F-450, and F-550 trucks used in commercial fleets, towing, construction, agriculture, and other heavy-duty operations requiring dependable emissions control.

Installation Notes
Before installation, allow the exhaust and aftertreatment system to cool completely. Remove the existing DOC/DPF assembly and inspect surrounding pressure sensors, temperature sensors, clamps, and exhaust connections for wear or contamination. Install the replacement assembly using the appropriate mounting hardware and sealing components to ensure proper alignment and a leak-free fit. After installation, verify successful regeneration operation and clear any stored diagnostic fault codes using approved service equipment.

Final Thoughts
If your Ford Powerstroke 6.4L-powered truck is experiencing regeneration issues, excessive exhaust backpressure, or emissions-related warning lights, replacing the DOC/DPF assembly with the correct OEM component can help restore dependable aftertreatment operation. The Ford Powerstroke 6.4L DOC/DPF assembly (OEM 9C3Z-5H221-B) is a critical component for supporting efficient exhaust filtration, reliable emissions control, and long-lasting diesel truck performance.