AP Exhaust 642191 Catalytic Converter - Rear Left

Direct-Fit Catalytic Converter for Toyota 4Runner and FJ Cruiser

AP Exhaust 642191 is a Federal / EPA direct-fit catalytic converter built for rear left applications on select Toyota 4Runner and Toyota FJ Cruiser models. It uses a stainless steel body, a ceramic substrate, and OE-style 2-bolt welded flanges to support proper fitment and exhaust sealing.

For buyers searching for a direct-fit catalytic converter for a 2003-2012 Toyota 4Runner rear left or a 2007-2012 Toyota FJ Cruiser rear left, this AP Exhaust 642191 unit is built to match the original mounting layout and emissions configuration.

Key Features

• Federal / EPA direct-fit catalytic converter
• Stainless steel body for corrosion resistance
• Ceramic substrate material
• 2-bolt welded flange inlet and outlet
• 1 O2 sensor port
• Inlet gasket and outlet gasket included
• Overall length: 28 inches
• Built to OE dimensions and fitment targets

Product Details

AP Exhaust part number 642191 uses ARISTO substrate chemistry and modern manufacturing methods to produce a converter with efficient catalyst loading and consistent fit. The OE-style dimensions help it align with the factory exhaust path on the rear left side of the Toyota 4Runner and Toyota FJ Cruiser, while the stainless steel housing supports long-term exhaust service. This part number 642191 is a direct replacement style converter for emissions-controlled applications listed below.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Vehicle Fitment

• Fits 2003-2012 Toyota 4Runner, rear left. Direct Fit; Federal and California Emissions. Not for sale or use on vehicles licensed in CA, CO, ME, or NY. Restrictions may apply in other states.
• Fits 2012 Toyota 4Runner, rear left. Direct Fit; TO 08/12; Federal and California Emissions. Not for sale or use on vehicles licensed in CA, CO, ME, or NY. Restrictions may apply in other states.
• Fits 2007-2012 Toyota FJ Cruiser, rear left. Direct Fit; Federal and California Emissions. Not for sale or use on vehicles licensed in CA, CO, ME, or NY. Restrictions may apply in other states.

Common Issues This Part Addresses

• Failed catalytic converter efficiency codes
• Exhaust leaks at the converter flange connections
• Restricted exhaust flow from a worn substrate
• Emissions test failure related to converter performance
• Noise or odor caused by a deteriorated rear left converter

Installation Notes and Quality Assurance

Verify the rear left position, emissions type, and model-year application before installation. The converter uses 2-bolt welded flanges at both ends and includes inlet and outlet gaskets; no inlet or outlet hardware is listed. Confirm O2 sensor port placement and compare the factory exhaust layout on the vehicle before final fitment.

AP Exhaust uses automated workstations, spinner welding equipment, and high-speed production lines to build converters to exact OE dimensions and fitment targets. Part number 642191 is manufactured for consistent installation on the specified Toyota 4Runner and Toyota FJ Cruiser applications.