Catalytic Converter for Toyota Highlander (2004-2007) 3.3L Rear

Direct-Fit Rear Catalytic Converter for 2004-2007 Toyota Highlander

What it Does: The rear catalytic converter for the 2004-2007 Toyota Highlander restores proper exhaust backpressure and catalytic reduction efficiency to eliminate P0420/P0430 diagnostic trouble codes and maintain legal tailpipe emissions.

The Stock Toyota Highlander Exhaust Degradation and Substrate Breakdown

Over extended mileage, the factory rear catalytic converter on the XU20 platform suffers from thermal cycling fatigue, oil ash contamination, and washcoat sintering. As the internal washcoat depletes, the precious metal catalyst loses oxygen storage capacity, triggering check engine lights and reducing exhaust scavenging efficiency. Structural deterioration of the factory ceramic washcoat can also cause partial substrate collapse, creating restrictive exhaust bottlenecks that hinder engine efficiency.

The Engineering Solution

Constructed from high-grade stainless steel with precision-aligned flanges, this direct-fit rear catalytic converter replaces degraded OEM emissions hardware without cutting or custom welding. The unit incorporates a high-flow honeycomb ceramic monolith substrate engineered with optimized precious metal surface loading for efficient NOX, CO, and hydrocarbon reduction. Heavy-duty spun-body construction provides exceptional thermal fatigue resistance and corrosion protection against harsh road salts and underbody debris.

Technical Specifications

Compatibility

• 2004 Toyota Highlander 3.3L V6 (Base, Limited)
• 2005 Toyota Highlander 3.3L V6 (Base, Limited)
• 2006 Toyota Highlander 3.3L V6 (Base, Limited, Sport)
• 2007 Toyota Highlander 3.3L V6 (Base, Limited, Sport)

Frequently Asked Questions

Does this fit the XU20 Highlander?
Yes, this is a direct fit for the 2004-2007 Toyota Highlander equipped with the 3MZ-FE 3.3L engine.

Is this catalytic converter CARB-compliant for California?
No, this is a direct-replacement EPA-compliant converter and is not legal for sale or use in California or CARB-restricted states.

The Toyota Reliability Standard

Engineered to withstand harsh thermal loads and prolonged daily driving cycles, this bolt-on catalytic converter delivers uncompromising emissions compliance and corrosion resistance for high-mileage dependability.