Walker 16552 Catalytic Converter - Left

Walker EPA Direct-Fit Catalytic Converter

Walker EPA Ultra Direct-Fit Catalytic Converter 16552 is a direct-fit exhaust replacement for select 2003-2004 Ford Expedition left-side applications. Built with a stainless steel body and ceramic substrate, it is designed for OBDII vehicles and follows EPA compliance requirements for the listed fitment.

For buyers searching for a 2003 Ford Expedition catalytic converter, a 2004 Ford Expedition left under floor converter, or Walker 16552 direct-fit exhaust replacement, this part is built around the original connection points and emissions layout.

Key Features

• Direct-fit catalytic converter for specific vehicle applications
• Fits 2003-2004 Ford Expedition, left under floor
• EPA-compliant design for listed federal-emissions applications
• Stainless steel body with oval housing
• Ceramic substrate material
• 2-bolt loose flange inlet with spherical flare
• Pipe connection outlet with 2.5 in. outside diameter
• Pre- and post-catalyst oxygen sensor location
• Mounting hardware included
• Walker EPA product line for import and domestic OBDII vehicles

Product Details

Walker 16552 is part of the Walker EPA line, which focuses on direct-fit catalytic converters for 1996-and-newer OBDII vehicles. This converter is configured for the left under-floor position on the Ford Expedition and uses a specific-fit layout to match the listed inlet, outlet, and sensor placement. The stainless steel body measures 36 inches overall, with a standard oval shape sized for the application.

This part cross-references Eastern Catalytic 30456 for the same application. Walker 16552 is listed for 2003-2004 Ford Expedition models with federal and California emissions coverage in the fitment data, while also noting state-use restrictions for CARB-compliant states.

Common Replacement Reasons

• Check engine light related to catalyst efficiency codes
• Failed emissions inspection on the listed Ford Expedition application
• Exhaust restriction or reduced exhaust flow from a worn converter
• Rattling or damaged catalyst substrate inside the converter body
• Corrosion or leakage at the inlet or outlet connection points

Installation Notes

Fits 2003-2004 Ford Expedition, left. Exhaust gasket is recommended during installation. Verify the inlet and outlet connection style, oxygen sensor placement, and under-floor left-side routing before installation. This converter is not legal for sale or use in California and other CARB-compliant states; it is legal in New York and Maine on EPA Federal Emission Equipped Vehicles only, according to the fitment notes.

Quality Assurance

Walker EPA converters are built for EPA-standard compliance and direct-fit replacement on listed applications. Part number 16552 is engineered for the specified Ford Expedition fitment and emissions configuration.