Catalytic Converter for Acura MDX (2003-2006) 3.5L Rear

Direct-Fit Rear Catalytic Converter for 2003-2006 Acura MDX

What it Does: The direct-fit rear catalytic converter replaces the clogged or degraded downstream emissions unit on the 2003-2006 MDX to eliminate P0420 DTCs, normalize exhaust backpressure, and restore engine efficiency.

The Stock Acura MDX Catalytic Degradation

Over extended operating cycles, the factory underfloor secondary catalytic converter on the YD1 chassis experiences washcoat sintering and thermal breakdown. With age and sustained thermal cycling from the J35A5 3.5L V6, the stock ceramic brick degrades, resulting in reduced hydrocarbon and NOx reduction efficiency, exhaust flow restriction, elevated exhaust gas temperatures (EGT), and persistent diagnostic trouble codes.

The Engineering Solution

Constructed from corrosion-resistant 409 stainless steel, this complete replacement unit features CNC-machined direct-fit flanges designed for leak-free, bolt-on mating without cutting or custom fabrication. Internally, a dense ceramic monolith substrate is engineered with an optimized precious metal catalytic loading (platinum, palladium, and rhodium) to restore factory exhaust scavenging, lower tailpipe emissions, and preserve OEM sensor feedback. Supplied mounting hardware and precision gaskets guarantee a rigid, exhaust-tight seal compatible with interchange 16351.

Technical Specifications

Compatibility

• 2003 Acura MDX Base & Touring 3.5L V6 (Rear)
• 2004 Acura MDX Base & Touring 3.5L V6 (Rear)
• 2005 Acura MDX Base & Touring 3.5L V6 (Rear)
• 2006 Acura MDX Base & Touring 3.5L V6 (Rear)

Frequently Asked Questions

Does this fit the YD1 MDX?
Yes, this is a direct fit for the 2003-2006 Acura MDX equipped with the J35A5 engine in the rear exhaust position.

Will this resolve an active P0420 diagnostic trouble code?
Yes, replacing an exhausted rear substrate restores correct catalyst efficiency parameters to resolve downstream sensor fault codes.

The Acura Engineering Standard

Engineered for high-mileage JDM luxury platforms, this emissions assembly maintains smooth low-end torque delivery, factory cabin acoustics, and reliable exhaust scavenging across severe daily driving conditions.