{"product_id":"oxygen-sensors-for-buick-lacrosse-2005-2007-3-8l-upstream-downstream","title":"Oxygen Sensors for Buick LaCrosse (2005-2007) 3.8L Upstream \u0026 Downstream","description":"\u003ch2\u003eDirect-Fit Oxygen Sensor Kit for 2005-2007 Buick LaCrosse\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Oxygen Sensor Kit replaces degraded factory upstream and downstream sensors on the 2005-2007 LaCrosse to restore stoichiometric fuel trim accuracy and proper catalyst efficiency monitoring.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Buick LaCrosse Sensor Deterioration\u003c\/h3\u003e\n\u003cp\u003eOver extended drive cycles, factory zirconia sensors on the \u003cstrong\u003eGM W-Body\u003c\/strong\u003e platform succumb to exhaust soot accumulation, thermal fatigue, and chemical poisoning from fuel additives or minor oil blow-by. As the internal ceramic electrolyte ages, response times slow significantly, skewing short- and long-term fuel trims. This thermal decay causes the PCM to command richer fuel delivery, dropping fuel economy, fouling spark plugs, and triggering diagnostic trouble codes such as P0131, P0137, P0171, or P0420.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered to match factory switching velocity and impedance thresholds, this 2-piece set stabilizes exhaust gas monitoring across both banks. Featuring high-grade stainless steel outer housings and factory-pinned harness connectors, these sensors eliminate the signal distortion common with universal cut-and-splice alternatives. Planar ceramic sensing elements with integrated heating units ensure rapid closed-loop activation during cold starts, reducing cold-cycle emissions and preventing persistent catalytic converter wear.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\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;\"\u003e2005-2007 Buick LaCrosse\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;\"\u003e3.8L Series III L26 V6 \/ GM W-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;\"\u003e200 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;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2005 Buick LaCrosse CX (3.8L V6 L26)\u003c\/li\u003e\n  \u003cli\u003e2005 Buick LaCrosse CXL (3.8L V6 L26)\u003c\/li\u003e\n  \u003cli\u003e2006 Buick LaCrosse CX (3.8L V6 L26)\u003c\/li\u003e\n  \u003cli\u003e2006 Buick LaCrosse CXL (3.8L V6 L26)\u003c\/li\u003e\n  \u003cli\u003e2007 Buick LaCrosse CX (3.8L V6 L26)\u003c\/li\u003e\n  \u003cli\u003e2007 Buick LaCrosse CXL (3.8L V6 L26)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the W-Body LaCrosse?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2005-2007 Buick LaCrosse equipped with the \u003cstrong\u003e3.8L Series III L26\u003c\/strong\u003e engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo these sensors require harness splicing or terminal repinning?\u003c\/strong\u003e\u003cbr\u003e No, these sensors feature OEM-matched weatherproof connectors designed for direct plug-in installation.\u003c\/p\u003e\n\n\u003ch3\u003eThe Buick Reliability Caliber\u003c\/h3\u003e\n\u003cp\u003eEngineered for the daily demands of GM's proven pushrod powertrains, this sensor kit restores smooth idle quality, optimal air-fuel mapping, and dependable emissions compliance without throwing false catalyst degradation codes.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50511137210616,"sku":"DS-E2ZKPEBES","price":79.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/oxygen-sensors-for-buick-lacrosse-2005-2007-3-8l-upstream-downstream-1.jpg?v=1789410599","url":"https:\/\/performancechiptuning.com\/es\/products\/oxygen-sensors-for-buick-lacrosse-2005-2007-3-8l-upstream-downstream","provider":"Performance Chip Tuning","version":"1.0","type":"link"}