Catalytic Converter for Ford Explorer (1991-1994) 4.0L Rear

Direct-Fit Rear Catalytic Converter for 1991-1994 Ford Explorer (UN46)

What it Does: The rear catalytic converter cleans downstream exhaust emissions and restores factory scavenging flow on the 1991-1994 Ford Explorer to eliminate exhaust restrictions and off-gas odors.

The Stock Ford Explorer Exhaust Flow Restriction & Catalyst Degradation

Factory exhaust converters on the first-generation UN46 chassis frequently succumb to thermal fatigue, internal washcoat sintering, and substrate fracturing after decades of service. When unburned hydrocarbons and carbon soot from the aging pushrod engine contaminate the original core, the ceramic monolith clogs. This creates excessive exhaust backpressure upstream, suffocating engine efficiency, spiking cylinder head temperatures, and triggering failed emissions inspections due to depleted catalyst precious metal loading.

The Engineering Solution

This direct-replacement rear catalytic converter assembly features a heavy-gauge Stainless Steel outer shell engineered to resist road salt corrosion and weld failure. Inside, a high-efficiency ceramic honeycomb monolith provides an expansive surface area coated with catalyst washcoat to efficiently reduce carbon monoxide (CO), hydrocarbons (HC), and oxides of nitrogen (NOx). Built with precision-aligned mounting flanges that line up to stock hangers, this assembly eliminates the need for cutting or custom fabrication, ensuring factory-spec exhaust backpressure and reliable emissions compliance.

Technical Specifications

Compatibility

• 1991 Ford Explorer 4.0L V6 (Rear Position)
• 1992 Ford Explorer 4.0L V6 (Rear Position)
• 1993 Ford Explorer 4.0L V6 (Rear Position)
• 1994 Ford Explorer 4.0L V6 (Rear Position)

Frequently Asked Questions

Does this fit the UN46 Explorer?

Yes, this is a direct fit for the 1991-1994 Ford Explorer equipped with the Cologne 4.0L V6 (OHV) engine.

Is this catalytic converter legal for road use in California?

No, this unit is 46-state legal (EPA compliant) and cannot be shipped to or registered on vehicles in California, New York, Colorado, or Maine.

The Ford Utility Durability Standard

Built to handle harsh underbody conditions, off-road vibrations, and high-temp exhaust cycling, this converter restores the towing confidence, low-end torque, and rugged reliability expected from your utility platform.