Catalytic Converter for Ford Excursion (2000-2005) 5.4L/6.8L Lower

Direct-Fit Lower Catalytic Converter for 2000-2005 Ford Excursion (U137)

What it Does: The direct-fit lower catalytic converter replaces degraded factory emissions units on the 2000-2005 Excursion to resolve catalyst-efficiency diagnostic trouble codes and restore exhaust scavenging.

The Stock Ford Excursion Catalyst Degradation

Factory catalytic converters on the heavy-duty U137 chassis undergo severe thermal cycling, exacerbated by sustained exhaust gas temperatures encountered during heavy towing. Over time, the internal ceramic brick suffers washcoat thermal sintering and micro-fracturing. This structural deterioration leads to mechanical washcoat attrition, reduced noble-metal surface reactivity, and loose ceramic fragments rattling within the casing, frequently triggering persistent P0420 and P0430 diagnostic trouble codes.

The Engineering Solution

This replacement lower assembly is constructed with heavy-gauge stainless steel tubing and a dual-wall outer shell designed to withstand corrosion, road debris, and prolonged heat soak. Inside, a high-cell-density ceramic honeycomb substrate features an optimized washcoat enriched with platinum, palladium, and rhodium to restore chemical reduction of NOx and oxidation of CO and hydrocarbons. Precision robotic welding ensures airtight joints, while factory-located sensor bungs and laser-cut flanges deliver true direct-fit alignment with OEM downpipes without cutting or welding.

What's Included

• 1 x Direct-fit lower catalytic converter
• Exhaust gasket(s) and mounting hardware

Technical Specifications

Compatibility

• 2000-2005 Ford Excursion 5.4L V8 (Lower Position)
• 2000-2005 Ford Excursion 6.8L V10 (Lower Position)

Frequently Asked Questions & Fitment Warnings

Does this fit the U137 Excursion?

Yes, this is a direct fit for the 2000-2005 Ford Excursion equipped with the 5.4L Triton V8 or 6.8L Triton V10 engine. Not legal for sale or use in California or CARB-adopting states; not compatible with Powerstroke Diesel models.

Will this unit resolve catalyst efficiency trouble codes?

It clears P0420 and P0430 codes caused by depleted catalyst efficiency, provided oxygen sensors and exhaust manifolds are free of leaks and functioning correctly.

The Ford Heavy-Duty Caliber

Engineered to handle the demanding exhaust backpressures and prolonged thermal loads of full-size towing, this converter restores reliable emissions compliance and factory exhaust flow on heavy-duty Ford platforms.