Catalytic Converter for Ford Expedition (2003-2004) 5.4L Left & Right

Direct-Fit Left & Right Catalytic Converter Set for 2003-2004 Ford Expedition (U222)

What it Does: The catalytic converter set replaces deteriorated factory emissions equipment on the 2003-2004 Ford Expedition to restore correct exhaust backpressure, eliminate P0420/P0430 DTC codes, and ensure reliable 48-state emissions compliance.

The Stock Ford Expedition Substrate Degradation

The factory catalytic converters on the U222 Expedition endure sustained exhaust gas temperatures that degrade the internal washcoat over extended mileage. Compounded by common ignition misfires or unburned fuel wash from the 2-valve 5.4L Triton V8, the stock ceramic monoliths frequently suffer thermal shock, structural sintering, and substrate clogging. This degradation creates elevated exhaust backpressure, increases cylinder head temperatures, robs towing power, and triggers persistent check engine lights.

The Engineering Solution

Engineered as a direct-fit dual-bank replacement, this left- and right-side converter assembly features mandrel-formed aluminized steel tubing to resist road debris, road salt, and harsh thermal cycling. Internally, a heavy-duty ceramic substrate utilizes an optimized cell density to maximize surface contact, accelerating catalytic light-off and neutralizing exhaust emissions without choking scavenging flow. Integrated factory-location O2 sensor bungs, reinforced brackets, and thick-gauge flanges replicate interchange units 30465, 30466, 19036, and 19136 for a precise bolt-on installation without welding.

Technical Specifications

Compatibility

• 2003-2004 Ford Expedition Eddie Bauer 5.4L V8 (Production dates after 10/17/2002)
• 2003-2004 Ford Expedition XLT 5.4L V8 (Production dates after 10/17/2002)
• 2004 Ford Expedition NBX 5.4L V8
• 2004 Ford Expedition XLS 5.4L V8
• Note: Fits 5.4L V8 models only; does not fit 4.6L V8 engines. 48-state legal (restricted in CA, NY, CO, and ME).

Frequently Asked Questions

Does this fit the U222 Expedition?

Yes, this is a direct fit for the 2003-2004 Ford Expedition equipped with the 5.4L Triton engine built after October 17, 2002.

Will this resolve P0420 and P0430 trouble codes?

Yes, replacing deteriorated factory converters with this high-efficiency substrate restores catalyst oxygen storage capacity, resolving P0420 and P0430 DTCs.

The Ford Towing Standard

Engineered to handle sustained load and trailering demands, this exhaust assembly maintains critical low-end torque curves and factory thermal management under heavy utility use.