Catalytic Converter for Ford Focus (2016-2018) 2.3L

Direct-Fit Stainless Catalytic Converter for 2016-2018 Ford Focus (C346)

What it Does: This direct-fit catalytic converter replaces the turbo-back emissions unit on the 2016-2018 Ford Focus RS (C346) with the 2.3L EcoBoost engine to restore HC, CO, and NOx conversion and eliminate exhaust restriction.

The Stock Ford Focus Catalytic Converter Failure

Mounted directly behind the turbocharger on the C346 Focus RS, the factory catalytic converter endures extreme exhaust gas temperatures from the 2.3L EcoBoost engine. Repeated thermal cycling and fuel enrichment during high-boost driving fracture the internal ceramic substrate and fatigue the factory welds. Once the precious-metal washcoat degrades or breaks apart, exhaust flow becomes restricted and catalyst efficiency drops below ECU thresholds, triggering persistent P0420 and P0430 check engine lights.

Common Symptoms of a Failing OEM Catalytic Converter

• Check Engine Light / DTCs: Stored P0420 or P0430 catalyst system efficiency below threshold codes triggered by degraded oxygen storage capacity.
• Metallic Exhaust Rattle: Audible rattling beneath the firewall caused by a fractured ceramic honeycomb bouncing inside the housing.
• Boost & Emissions Loss: Elevated exhaust backpressure dulling turbocharger spool and causing failed OBD-II emissions inspections.

The Direct-Fit Stainless Catalytic Converter Solution

Constructed from corrosion-resistant stainless steel, this direct-fit unit houses an 8-inch by 5-inch body containing a ceramic honeycomb substrate with a precious-metal washcoat for reliable emissions scrubbing. A factory-matched turbo-side flange, integrated braided flex joint, OE-spec hanger rods, and a pre-catalyst O2 sensor bung deliver a precise bolt-on installation with no cutting or welding. The reinforced piping resists heat cracking while restoring unobstructed flow and factory OBD-II compliance.

What's Included

• 1 x Direct-Fit Catalytic Converter
• 1 x Ring Seal
• 2 x Bolts with Washers

Technical Specifications

Compatibility

• Make: Ford
• Model: Ford Focus RS 2.3L EcoBoost
• Years: 2016, 2017, 2018
• Engine: 2.3L turbocharged I4 (EcoBoost)
• Exclusions: Does not fit Focus 1.0L, 2.0L, or Focus ST models

Frequently Asked Questions & Fitment Warnings

Does this fit the C346 Focus?

Yes. This is a direct fit for the 2016-2018 Ford Focus RS equipped with the 2.3L EcoBoost engine. It does not fit Focus 1.0L, 2.0L, or Focus ST models, and as an EPA (federal) converter, it is not CARB approved for vehicles registered in California, New York, Colorado, or Maine.

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

Yes, it clears catalyst-efficiency codes caused by a worn converter, though oxygen sensors are not included. Replacing a degraded substrate restores proper conversion efficiency to clear P0420/P0430 faults once exhaust leaks and sensor operation are verified; transfer your existing O2 sensors or install new ones.

Are gaskets and mounting hardware included for installation?

Yes, a ring seal and two bolts with washers are included. Let the exhaust cool completely, soak seized fasteners with penetrating oil, and torque the turbo-side and rear flange joints evenly to prevent leaks.

The Ford Performance Standard

Engineered to handle the thermal output of turbocharged hot-hatch driving, this converter restores crisp turbo response and steady exhaust flow. It keeps your 2.3L EcoBoost running clean, rattle-free, and free of catalyst-efficiency fault codes under daily or spirited use.