{"product_id":"catalytic-converter-for-buick-lesabre-1997-2005-3-8l-front","title":"Catalytic Converter for Buick LeSabre (1997-2005) 3.8L Front","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Front Catalytic Converter for 1997-2005 Buick LeSabre (GM H\/G-Body)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Front Catalytic Converter replaces the degraded factory emissions unit on the 1997-2005 Buick LeSabre to restore exhaust velocity, eliminate catalyst efficiency diagnostic trouble codes, and ensure clean tailpipe emissions.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Buick LeSabre Catalyst Deterioration\u003c\/h3\u003e\n\u003cp\u003eOn high-mileage \u003cstrong\u003eGM H-Body\u003c\/strong\u003e and \u003cstrong\u003eG-Body\u003c\/strong\u003e sedans powered by the \u003cstrong\u003e3800 Series II L36\u003c\/strong\u003e engine, the factory ceramic washcoat progressively degrades due to thousands of thermal cycles and persistent rich-lean transitions. Internal monolith sintering and exhaust carbon fouling choke down the cell matrix, creating severe exhaust backpressure that hampers volumetric efficiency, spikes cylinder head temperatures, and triggers recurring P0420 catalyst efficiency codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis front-position catalytic converter assembly utilizes a heavy-gauge, corrosion-resistant stainless steel outer shell engineered to withstand road wash and thermal expansion. Internally, a high-flow ceramic honeycomb substrate features an optimized washcoat loaded with noble metals (platinum, palladium, and rhodium) to efficiently oxidize unburnt hydrocarbons and carbon monoxide while reducing nitrogen oxides. Precision-stamped flanges and factory-located O2 sensor bungs eliminate the need for custom cutting or welding, reinstating original exhaust acoustics and low-restriction flow back to the intermediate pipe.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e1997-2005 Buick LeSabre\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e3800 Series II (L36) \/ GM H-Body \u0026amp; G-Body\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e205 hp \/ 230 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e41407, 16386\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1997-2005 Buick LeSabre Custom 3.8L V6\u003c\/li\u003e\n  \u003cli\u003e1997-2005 Buick LeSabre Limited 3.8L V6\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the GM H\/G-Body LeSabre?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 1997-2005 Buick LeSabre equipped with the naturally aspirated \u003cstrong\u003e3800 Series II L36\u003c\/strong\u003e engine.\u003c\/p\u003e\n\n\u003ch4\u003eWill this direct-fit converter clear a P0420 diagnostic trouble code?\u003c\/h4\u003e\n\u003cp\u003eAssuming no active downstream O2 sensor failures or upstream misfires exist, the fresh catalyst substrate restores proper oxygen storage capacity to clear P0420 codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Buick Reliability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to preserve the quiet, vibration-free highway cruising characteristics of Buick's full-size platform, this unit maintains correct exhaust backpressure to protect downstream components without introducing rasp or cabin resonance.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67537978523896,"sku":"DS-EKJ44BXBZ","price":118.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-buick-lesabre-1997-2005-3-8l-front-1.jpg?v=1790620312","url":"https:\/\/performancechiptuning.com\/products\/catalytic-converter-for-buick-lesabre-1997-2005-3-8l-front","provider":"Performance Chip Tuning","version":"1.0","type":"link"}