Catalytic Converter for Ford F-150 (2004-2005) 5.4L Left & Right

Direct-Fit Replacement Catalytic Converter Set for 2004-2005 Ford F-150 (P221)

What it Does: The catalytic converter set replaces deteriorated factory emissions units on the 2004-2005 Ford F-150 to restore exhaust gas velocity, resolve catalytic inefficiency trouble codes, and ensure federal emissions compliance.

The Stock Ford F-150 Exhaust Substrate Deterioration

Factory catalytic converters on the P221 chassis F-150 are prone to structural breakdown over sustained thermal cycles. High exhaust gas temperatures combined with the notorious misfire and unburnt fuel cycles common on the 5.4L Triton 3V engine degrade the washcoat and cause internal ceramic honeycomb meltdown. This deterioration leads to exhaust restriction, severe backpressure, diminished low-end torque, and inevitable P0420/P0430 onboard diagnostic trouble codes.

The Engineering Solution

This direct-fit left and right assembly is engineered with a corrosion-resistant stainless steel outer casing and a high-flow ceramic substrate formulated with precious-metal catalyst loading. Precision-aligned factory-style inlet and outlet flanges eliminate the need for cutting or custom fabrication, ensuring an airtight seal that withstands heavy-duty thermal expansion during sustained engine load and towing operations.

What's Included

• 1x Catalytic Converter Set (Bank 1 and Bank 2 / Left and Right)
• Bolts
• Screws
• Seal

Technical Specifications

Compatibility

• 2004-2005 Ford F-150 (XL, XLT, Lariat, FX4, King Ranch) 5.4L V8

Frequently Asked Questions & Fitment Warnings

Does this fit the P221 F-150?

Yes, this is a direct fit for the 2004-2005 Ford F-150 equipped with the 5.4L Triton 3V engine; it does not fit models equipped with the 4.2L V6 or 4.6L V8 engines, nor 2004 Heritage models.

Is this catalytic converter legal in California or New York?

No, this unit is EPA compliant for Federal emissions standards and is not legal for sale, installation, or use on vehicles registered in California or New York.

The Ford Workhorse Standard

Built to handle the harsh duty cycles of half-ton towing and high payload stress, this converter assembly restores critical exhaust scavenging without compromising low-end torque or triggering downstream oxygen sensor faults.