AP Exhaust 771388 Catalytic Converter - Front Left

CARB-Compliant Direct-Fit Catalytic Converter

AP Exhaust 771388 is a CARB compliant direct-fit catalytic converter built for exact OE dimensions and fitment. It is engineered for the front left position on select Buick LaCrosse models and uses a stainless steel body with a ceramic substrate for dependable exhaust flow and emissions control.

Part of the AP Exhaust AGMXJ03.0157 product line, this converter is manufactured with automated workstations, spinner welding equipment, and high-speed production processes to help maintain consistent dimensions and fitment. For California emissions applications, AP Exhaust 771388 is identified with Executive Order D-798-9.

• CARB compliant direct-fit catalytic converter
• Stainless steel body construction
• Ceramic substrate material
• 2 O2 sensor ports
• 4-bolt welded flange inlet and 2-bolt welded flange outlet
• Outlet gasket and outlet hardware included
• Overall length: 16 inches
• Fits the front left position

Detailed Fitment and Application

Compatible with 2010 Buick LaCrosse, front left; 2012 Buick LaCrosse, front left; 2013 Buick LaCrosse, front left; 2014 Buick LaCrosse, front left; 2015 Buick LaCrosse, front left; and 2016 Buick LaCrosse, front left. This AP Exhaust catalytic converter is a direct-fit replacement for California emissions applications and is built to match OE-style dimensions for the listed Buick LaCrosse fitments. The AP Exhaust 771388 part number is the correct reference for this application, and it is also associated with the AGMXJ03.0157 line.

What This Converter Helps Address

• Failed emissions testing due to a worn or inefficient catalytic converter
• Check engine light concerns related to catalyst efficiency codes
• Exhaust restriction caused by a deteriorated substrate
• Fitment issues from non-direct-fit replacement parts
• California emissions compliance needs for the listed Buick LaCrosse models

Installation Notes and Tips

Verify the front left position, flange style, and O2 sensor port count before installation. This converter uses a 4-bolt welded flange inlet and a 2-bolt welded flange outlet, with no inlet gasket or inlet hardware included. The outlet gasket and outlet hardware are included. Confirm the vehicle’s emissions label and EO requirement match D-798-9 before installation. Professional installation is recommended for proper sealing and sensor placement.

Quality Assurance

AP Exhaust Holdings, LLC manufactures this converter to OE dimensions using controlled production methods and emissions-focused substrate chemistry. Executive Order D-798-9 identifies this unit for California-compliant applications on the listed Buick LaCrosse vehicles.