Catalytic Converter for Ford C-Max (2013-2018) 2.0L

Direct-Fit Manifold Catalytic Converter for 2013-2018 Ford C-Max (C344)

What it Does: This direct-fit manifold catalytic converter assembly bolts to the cylinder head of the 2013-2018 Ford C-Max (C344) C20HDEX 2.0L Atkinson-Cycle I4 engine to restore exhaust flow and convert HC, CO, and NOx emissions.

The Stock Ford C-Max Manifold Converter Failure

On the C344 chassis equipped with the C20HDEX 2.0L Atkinson-Cycle I4 hybrid powertrain, constant thermal cycling from frequent engine start-stop transitions subjects the close-coupled manifold converter to severe heat soak. Over time, thermal shock and exhaust vibration cause the factory ceramic honeycomb substrate to fracture, melt, or delaminate inside the shell. As precious-metal washcoat efficiency degrades or broken substrate blocks the integrated flex pipe, exhaust backpressure spikes and downstream oxygen sensors trigger catalyst efficiency fault codes like P0420 and P0430.

Common Symptoms of a Failing OEM Catalytic Converter

• Check Engine Light / DTCs: Illuminated MIL with P0420 or P0430 catalyst efficiency below threshold codes stored in the PCM.
• Metallic Exhaust Rattle: Audible rattling beneath the firewall during idle or hybrid engine transitions caused by a fractured ceramic core.
• Backpressure & Emissions Failure: Sluggish throttle response, elevated exhaust temperatures, and failed emissions testing due to restricted exhaust flow.

The Direct-Fit Stainless Exhaust Solution

Engineered as a complete exhaust manifold, catalytic converter, and flex front pipe assembly, this replacement features a corrosion-resistant stainless steel body and tubular runners that resist heat cracking. Inside, a ceramic honeycomb substrate coated with a precious-metal washcoat restores proper HC, CO, and NOx conversion for OBD-II compliance. Precision-welded factory head and outlet flanges, OEM-style support brackets, and dual pre- and post-catalyst O2 sensor ports provide a true bolt-on installation with no cutting or welding.

What's Included

• 1 x Manifold Catalytic Converter with integrated flex front pipe
• 1 x Manifold Gasket
• 1 x Outlet Flange Gasket
• Mounting studs and nuts

Technical Specifications

Compatibility

• 2013-2018 Ford C-Max Hybrid (2.0L I4)
• 2013-2018 Ford C-Max Energi Plug-In Hybrid (2.0L I4)

Frequently Asked Questions & Fitment Warnings

Does this fit the C344 C-Max?

Yes. This is a direct fit for the 2013-2018 Ford C-Max Hybrid and C-Max Energi equipped with the C20HDEX 2.0L Atkinson-Cycle I4 engine. This EPA federal converter is not CARB approved and cannot be installed on vehicles registered in California, New York, Colorado, or Maine.

Will this clear P0420/P0430 codes, and are O2 sensors included?

Yes, if a degraded converter is the root cause. Restoring catalyst efficiency clears P0420 and P0430 codes once exhaust leaks are ruled out. Oxygen sensors are not included; transfer your existing sensors or install new units into the two factory O2 bungs.

Are gaskets and mounting hardware included for installation?

Yes. The kit includes the manifold gasket, outlet flange gasket, studs, and nuts. Let the exhaust cool completely, soak old fasteners with penetrating oil, and torque all flange hardware evenly before checking every joint for leaks.

The Ford Precision Standard

Built to handle hybrid start-stop thermal cycling, this stainless manifold converter restores accurate ECU feedback and emissions compliance on your C344 platform. Expect quiet exhaust flow, proper oxygen sensor switching, and reliable CEL-free operation.