Catalytic Converter for Ford Explorer Sport Trac (2001-2005) 4.0L Front & Rear

Direct-Fit Stainless Steel Catalytic Converter Assembly for 2001-2005 Ford Explorer Sport Trac (UN105)

What it Does: The direct-fit Front & Rear Catalytic Converter Set replaces deteriorated factory emissions equipment on the 2001-2005 Ford Explorer Sport Trac to eliminate P0420/P0430 diagnostic trouble codes and restore factory exhaust velocity.

The Stock Ford Explorer Sport Trac Catalytic Converter Degradation

Factory catalytic units on the UN105 chassis succumb to long-term washcoat thermal degradation, internal ceramic substrate fracture, and carbon fouling after extended heat cycles. Operating the Cologne 4.0L SOHC V6 under sustained towing loads elevates pre-catalyst exhaust gas temperatures, accelerating the breakdown of rare earth catalyst beds. Once the OEM honeycomb substrate crumbles or clogs, excessive exhaust backpressure chokes the cylinder heads, leading to downstream O2 sensor read errors, compromised fuel trims, and chronic check engine illumination.

The Engineering Solution

This comprehensive front and rear converter assembly delivers an exact-match direct replacement built from corrosion-resistant tubular Stainless Steel. Inside, high-efficiency ceramic honeycomb monoliths feature an optimized precious metal washcoat loading that ensures reliable catalytic reaction and proper hydrocarbon, CO, and NOx reduction. Precision mandrel-bent tube geometry maintains uniform exhaust flow dynamics and backpressure levels, matching factory scavenging parameters. Heavy-gauge laser-cut mounting flanges and pre-threaded oxygen sensor bungs mount straight to original hang points and Y-pipe junctions without requiring cutting or custom welding.

Technical Specifications

Compatibility

• 2001 Ford Explorer Sport Trac Base 4.0L V6
• 2002 Ford Explorer Sport Trac XL / XLT 4.0L V6
• 2003 Ford Explorer Sport Trac XLS / XLT 4.0L V6
• 2004 Ford Explorer Sport Trac XLS / XLT 4.0L V6
• 2005 Ford Explorer Sport Trac XLS / XLT / Adrenalin 4.0L V6

Frequently Asked Questions

Does this fit the UN105 Explorer Sport Trac?

Yes, this is a direct fit for the 2001-2005 Ford Explorer Sport Trac equipped with the 4.0L Cologne SOHC V6 engine.

Is this catalytic converter legal in all 50 states?

This unit is 46-state emissions compliant and cannot be legally sold or installed in California, New York, Colorado, or Maine.

The Ford Truck Reliability Standard

Engineered to handle tough duty cycles, this stainless steel replacement assembly withstands off-road chassis vibration and high exhaust thermal shock, ensuring sustained payload hauling and towing durability without downstream emissions failures.