{"product_id":"o2-oxygen-sensor-upstream-downstream-for-gmc-yukon-xl-2003-2006-6-0l","title":"O2 Oxygen Sensor Upstream Downstream for GMC Yukon XL (2003-2006) 6.0L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Complete O2 Oxygen Sensor Kit for 2003-2006 GMC Yukon XL (GMT800)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The complete 4-piece Upstream and Downstream O2 Sensor Kit restores closed-loop engine management and air-fuel ratio accuracy on the 2003-2006 GMC Yukon XL to eliminate check engine lights and improve fuel economy.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock GMC Yukon Sensor Degradation \u0026amp; Thermal Fatigue\u003c\/h3\u003e\n\u003cp\u003eOver extended operational lifecycles, factory zirconium dioxide oxygen sensors on high-displacement platforms experience severe thermal degradation and siloxane poisoning. In the \u003cstrong\u003eGMT800\u003c\/strong\u003e platform, the factory pre-catalytic and post-catalytic heated oxygen sensors (HO2S) endure continuous heat cycling and carbon accumulation from heavy towing regimes. As the platinum electrode coatings foul, signal response rates slow drastically. This sensor latency forces the PCM to default to baseline fuel trim tables, causing rich running conditions, erratic idle, reduced catalyst efficiency, and persistent diagnostic trouble codes like P0135, P0141, P0171, or P0420.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis 4-sensor replacement kit features double-protected 304 stainless steel housings that prevent thermal shock and contamination from exhaust condensate. Internal ceramic electrolyte cores deliver rapid microvolt-level switching between lean and rich exhaust states, restoring millisecond response times to the vehicle powertrain control module. Integrated internal high-wattage ceramic heaters reach optimal closed-loop operating temperatures quickly, slashing cold-start emissions. Each sensor features direct-fit weatherproof harness connectors, OE-grade wiring, and factory pinouts, eliminating the need for cutting, splicing, or resistance-altering butt connectors.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2x Upstream Oxygen Sensors\u003c\/li\u003e\n  \u003cli\u003e2x Downstream Oxygen Sensors\u003c\/li\u003e\n\u003c\/ul\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;\"\u003e2003-2006 GMC Yukon \/ Yukon XL\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;\"\u003e\n\u003cstrong\u003eVortec 6000 (LQ4 \/ LQ9)\u003c\/strong\u003e \/ \u003cstrong\u003eGMT800\u003c\/strong\u003e\n\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;\"\u003e320-335 hp \/ 365-380 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;\"\u003e213-4229, 234-4254, 234-4407, 234-4669, 2344254, SG1066, 213-1161, 2131161, 2134229, 234-4103, 234-4256, 234-4651, 2344103, 2344256, 2344651, 2344407, 2344669, 15282, 18144, 12572705\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\u003e2003 GMC Yukon XL 6.0L V8\u003c\/li\u003e\n  \u003cli\u003e2004 GMC Yukon XL 6.0L V8\u003c\/li\u003e\n  \u003cli\u003e2005 GMC Yukon XL 6.0L V8\u003c\/li\u003e\n  \u003cli\u003e2006 GMC Yukon XL 6.0L V8\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the GMT800 Yukon?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2003-2006 GMC Yukon XL equipped with the \u003cstrong\u003eVortec 6000 6.0L\u003c\/strong\u003e engine; confirm your engine displacement and connector profile before ordering.\u003c\/p\u003e\n\n\u003ch4\u003eDo these sensors require anti-seize compound during installation?\u003c\/h4\u003e\n\u003cp\u003eThread lubrication is recommended, but take extreme care to avoid contaminating the sensor probe head with anti-seize during installation.\u003c\/p\u003e\n\n\u003ch3\u003eThe GMC Heavy-Duty Reliability Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt to handle the sustained thermal demands of heavy payload towing and extreme drivetrain heat, these sensors safeguard your catalytic converters while maintaining dependable fuel delivery under maximum load.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67551320506616,"sku":"DS-EKSHQJ11R","price":76.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-gmc-yukon-xl-2003-2006-6-0l-1.jpg?v=1790794942","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-gmc-yukon-xl-2003-2006-6-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}