Eastern Convertors 40979 Catalytic Converter - Front Left

Direct-Fit Catalytic Converter for Maxima

Eastern Convertors DIRECT FIT Part Number 40979 is a Federal / EPA direct-fit pre-cat catalytic converter built to OE dimensions for precise replacement on the front left side. It is engineered for 2009-2023 Nissan Maxima applications, including 2021-2023 Federal and California emissions models and 2009-2020 radiator-side pre-cat applications where permitted.

Key Features

• Federal / EPA direct-fit pre-cat design
• Fits front left position on Nissan Maxima applications
• OE-style 6-bolt welded inlet and 3-bolt welded outlet
• Includes one inlet gasket and one outlet gasket
• Inlet hardware and outlet hardware are listed as included
• One O2 sensor port
• ECO III catalyst type
• 10.25-inch overall length
• Built using automated manufacturing and spinner welding for consistent fitment
• NANO substrate chemistry for efficient catalyst loading and lower-cost construction

Product Details

Eastern Convertors Part Number 40979 is part of the DIRECT FIT line, which focuses on OE-style replacement converters made to match factory dimensions and mounting points. For Nissan Maxima owners, this front left catalytic converter is a direct replacement for the radiator-side pre-cat configuration on 2009-2020 vehicles and for 2021-2023 Federal and California emissions applications. The converter uses an ECO III catalyst design and a single O2 sensor port to match the listed application requirements.

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

What It Helps Fix

• Failed catalytic converter efficiency codes
• Exhaust restriction from a deteriorated pre-cat
• Rattling or broken internal catalyst substrate
• Check engine light concerns related to emissions performance
• Exhaust leaks at the inlet or outlet flange areas

Installation Notes

Verify the vehicle’s emissions configuration before ordering. This part is listed for 2021-2023 Nissan Maxima front left Federal and California emissions applications, and for 2009-2020 Nissan Maxima front left radiator-side pre-cat applications with the stated legal note. Confirm the OE-style 6-bolt welded inlet, 3-bolt welded outlet, and single O2 sensor port match the original unit before installation. Part Number 40979 should be installed on the specified front left position only.

Quality Assurance

Eastern Convertors uses advanced manufacturing methods, including automated workstations, spinner welding equipment, and high-speed production lines, to build converters to exact OE dimensions and fitment. The DIRECT FIT line is produced with proprietary NANO substrate chemistry to support efficient catalyst loading and consistent replacement performance.