Catalytic Converter for Buick Lucerne (2009-2011) 3.9L Front

Direct-Fit Front Catalytic Converter for 2009-2011 Buick Lucerne

What it Does: The direct-fit front catalytic converter replaces deteriorated OEM emissions assemblies on the 2009-2011 Buick Lucerne to restore exhaust velocity, clear catalyst efficiency trouble codes, and maintain proper backpressure.

The Stock Buick Lucerne Substrate Breakdown

Factory exhaust converters on the GM G-Body platform paired with the LZ9 3.9L V6 suffer from thermal fatigue and substrate washcoat sintering over extended mileage. As the factory ceramic monolith degrades from sustained exhaust gas temperatures, internal cell walls crumble or coat over, restricting upstream scavenging and causing downstream oxygen sensors to trigger P0420 DTCs. This restriction increases backpressure, robbing the pushrod V6 of mid-range torque and degrading fuel economy.

The Engineering Solution

Engineered as a bolt-on replacement for part reference FCE016, this front assembly utilizes a heavy-gauge stainless steel outer shell paired with an aluminum-coated heat shield to withstand road debris and underbody thermal stress. Inside, a high-flow ceramic substrate is treated with a resilient precious-metal washcoat optimized for Federal EPA compliance, converting harmful hydrocarbons, carbon monoxide, and NOx into inert emissions. Laser-cut direct-fit flanges and included hardware ensure leak-free mating directly to the stock manifold and exhaust intermediate pipe without cutting or torch work.

Technical Specifications

Compatibility

• 2009 Buick Lucerne CX 3.9L V6 - Front
• 2009 Buick Lucerne CXL 3.9L V6 - Front
• 2010 Buick Lucerne CX 3.9L V6 - Front
• 2010 Buick Lucerne CXL 3.9L V6 - Front
• 2011 Buick Lucerne CX 3.9L V6 - Front
• 2011 Buick Lucerne CXL 3.9L V6 - Front

Frequently Asked Questions

Does this fit the G-Body Lucerne?
Yes, this is a direct fit for the 2009-2011 Buick Lucerne equipped with the LZ9 3.9L V6 engine.

Will this clear my P0420 catalytic converter code?
Yes, provided upstream oxygen sensors and fuel trims are within operating limits, this converter restores required catalytic reduction efficiency to eliminate catalyst-related check engine lights.

The Buick Reliability Standard

The Buick Lucerne is built for quiet highway cruising and smooth powertrain delivery. This replacement exhaust assembly restores original factory backpressure profiles and acoustic dampening, keeping cabin NVH low and the pushrod valvetrain running cleanly for thousands of reliable miles.