Catalytic Converter for Mazda B4000 (1998-2000) 4.0L Rear

Direct-Fit Rear Catalytic Converter for 1998-2000 Mazda B4000 (PN96)

What it Does: The rear catalytic converter treats secondary exhaust gases on the 1998-2000 Mazda B4000 to eliminate P0420/P0430 diagnostic trouble codes, restore factory backpressure, and ensure clean exhaust emissions.

The Stock Mazda B4000 Catalyst Degradation

With age and extended duty cycles, the original rear catalytic converter on the PN96 platform suffers from thermal fatigue, washcoat breakdown, and structural sintering of the internal brick. Unburned hydrocarbons and oil vapor from the pushrod Cologne 4.0L OHV V6 coat the precious metal washcoat, leading to thermal shock, substrate fracture, or heavy carbon fouling. This failure results in elevated tailpipe emissions, increased exhaust backpressure, downstream flow choking, and persistent catalyst efficiency check engine lights.

The Engineering Solution

This direct-fit replacement rear converter is engineered with a heavy-duty stainless steel outer shell designed to withstand underbody moisture, road salt, and harsh thermal cycling. Internally, a high-porosity ceramic honeycomb substrate loaded with an engineered formulation of platinum, palladium, and rhodium maximizes surface contact area to efficiently convert NOx, CO, and HC. Computer-controlled mandrel-formed inlets and precision OE-style flanged connections match original mounting locations, preventing common exhaust leaks, restoring clean scavenging, and directly replacing OE references FE53316, 23541, and 53316.

What's Included

• 1 direct-fit rear catalytic converter
• Installation accessories supplied with the converter

Technical Specifications

Compatibility

• 1998 Mazda B4000 4.0L V6 (Rear Position)
• 1999 Mazda B4000 4.0L V6 (Rear Position)
• 2000 Mazda B4000 4.0L V6 (Rear Position)

Frequently Asked Questions & Fitment Warnings

Does this fit the PN96 B4000?

Yes, this is a direct fit for the 1998-2000 Mazda B4000 equipped with the Cologne 4.0L OHV engine in the rear exhaust position. Note: This unit is 46-state legal and is NOT certified or legal for sale or use in California, New York, Colorado, or Maine emissions applications.

Is professional welding required to install this rear converter?

No, this unit features a direct-fit bolt-on design matching original flange patterns, though professional installation is recommended to guarantee a leak-free seal.

The Mazda Truck Standard

Engineered for workhorse reliability, this converter withstands high-exhaust-temperature towing demands and rough underbody trail abuse, preserving working torque delivery and keeping your utility truck fully compliant.