Catalytic Converter for Ford Expedition (2005-2006) 5.4L Left & Right

Direct-Fit Replacement Catalytic Converter for 2005-2006 Ford Expedition (U222)

What it Does: The catalytic converter replaces clogged or degraded emissions hardware on the 2005-2006 Ford Expedition to restore exhaust velocity, eliminate catalyst efficiency DTCs, and maintain OBD II emissions compliance.

The Stock Ford Expedition Catalyst Degradation and Exhaust Restriction

Factory exhaust converters on high-mileage U222 chassis trucks suffer from severe thermal cycling, oil contamination blow-by, and substrate deterioration. Over time, the internal monolithic honeycombs break down, melt, or plug, causing significant exhaust backpressure that spikes exhaust gas temperatures (EGTs) and starves the Modular 3V V8 of top-end power. Additionally, micro-cracks in aging OE seam welds induce downstream unmetered oxygen ingress, triggering persistent P0420/P0430 Diagnostic Trouble Codes and forcing improper air-fuel trim adjustments.

The Engineering Solution

Engineered as a bolt-on solution to OE exhaust geometry, this catalytic converter utilizes an aluminized and stainless steel outer casing that resists road-salt corrosion and high operating temperatures. Inside, a high-flow ceramic substrate is treated with a uniform precious-metal washcoat to chemically convert hydrocarbons, carbon monoxide, and NOx efficiently without constricting exhaust flow. Built with precise mandrel-formed transit sections, factory-spec mounting flanges, and two dedicated oxygen sensor bungs, it maintains precise closed-loop ECM sensor readouts while restoring factory power and throttle response.

What's Included

• 1 × Driver Side Catalytic Converter

Technical Specifications

Compatibility

• 2005 Ford Expedition 5.4L V8 (Left / Driver Side)
• 2006 Ford Expedition 5.4L V8 (Left / Driver Side)

Frequently Asked Questions & Fitment Warnings

Does this fit the U222 Expedition?

Yes, this is a direct fit for the 2005-2006 Ford Expedition equipped with the Modular 3V 5.4L engine. Note: This part is 46-state legal and cannot be shipped to or registered in California, New York, Colorado, or Maine.

Does this catalytic converter require custom welding or ECM tuning?

No, this direct-fit unit matches factory flange and O2 bung locations for direct bolt-on installation without tuning requirements or exhaust pipe modifications.

The Ford Expedition Heavy-Duty Durability

Engineered for full-size hauling and severe-duty towing cycles, this replacement converter ensures that your U222 truck maintains optimal exhaust scavenging and low backpressure under load, keeping exhaust gas temperatures controlled whether pulling trailers or enduring daily highway use.