Walker 16874 Catalytic Converter - Rear

Walker EPA Direct-Fit Catalytic Converter

Walker EPA Part Number 16874 is a direct-fit catalytic converter built for specific applications and engineered to meet EPA standards. It is designed for 2009-2012 Nissan Sentra rear applications with California Emission System equipment, making it a focused replacement for the correct vehicle setup.

Walker Ultra Direct-Fit Catalytic Converters are part of the EPA line, which centers on compliant replacement converters for import and domestic OBDII vehicles. This unit uses a stainless steel body with a ceramic substrate and a 2-bolt welded flange inlet and outlet for a direct replacement layout.

• Fits 2009-2012 Nissan Sentra, rear
• EPA-compliant replacement converter for OBDII vehicles
• Specific fit design for the listed application
• Stainless steel body with ceramic substrate
• 2-bolt welded flange inlet and outlet
• Pre-catalyst oxygen sensor location
• Walker Part Number 16874

Detailed Product Overview

This catalytic converter is built for the rear position on the 2009-2012 Nissan Sentra with California Emission System equipment. The round stainless steel body measures 4 inches high, 8 inches long, and 4 inches wide, with an overall length of 25.625 inches and 2.11-inch outlet diameter. Walker Part Number 16874 is a direct-fit solution for replacing the original emissions component while maintaining the correct flange-style connection points.

This part cross-references AP Exhaust 642800 and interchange number 52272 for the same application.

What This Part Helps Address

• Failed catalytic converter efficiency codes
• Exhaust restriction from a worn or damaged converter
• Emissions test failure related to converter performance
• Exhaust leaks at the converter flange connection
• Replacement needs for the rear converter on a Nissan Sentra

Installation Notes

Compatible With 2009-2012 Nissan Sentra rear applications using the California Emission System. An exhaust gasket is recommended, and additional parts 31364 and 31372 are needed to complete installation. Verify flange alignment, oxygen sensor placement, and emission-system requirements before installation. This converter is not CARB certified and is not legal for sale or use in California and other CARB-compliant states; it is legal in New York and Maine on EPA Federal Emission Equipped Vehicles only.

Quality Assurance

Walker EPA converters are built to comply with EPA standards and are intended for import and domestic OBDII vehicles. Part Number 16874 follows a direct-fit format for the listed Nissan Sentra application and uses a ceramic substrate with stainless steel construction for emissions-system replacement.