{"product_id":"o2-oxygen-sensor-upstream-downstream-for-gmc-yukon-2003-2006-6-0l","title":"O2 Oxygen Sensor Upstream Downstream for GMC Yukon (2003-2006) 6.0L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Oxygen Sensor Set for 2003-2006 GMC Yukon (GMT800)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The 4-piece oxygen sensor set replaces degraded factory lambda sensors on the 2003-2006 Yukon to restore factory closed-loop fuel metering, clear check engine lights, and maintain catalytic converter efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock GMC Yukon Sensor Degradation\u003c\/h3\u003e\n\u003cp\u003eFactory oxygen sensors on the \u003cstrong\u003eGMT800\u003c\/strong\u003e platform deteriorate from thermal cycling, exhaust soot, and silicone poisoning over extended service intervals. Over time, internal zirconia ceramic elements lose response speed, causing sluggish fuel trim adaptations by the powertrain control module. This latency leads to unburned hydrocarbon accumulation, reduced fuel economy, tailpipe emissions test failure, and diagnostic trouble codes such as \u003cstrong\u003eP0130\u003c\/strong\u003e, \u003cstrong\u003eP0135\u003c\/strong\u003e, \u003cstrong\u003eP0155\u003c\/strong\u003e, \u003cstrong\u003eP0420\u003c\/strong\u003e, and \u003cstrong\u003eP0430\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered for the \u003cstrong\u003eVortec 6000\u003c\/strong\u003e (\u003cstrong\u003eLQ4\u003c\/strong\u003e\/\u003cstrong\u003eLQ9\u003c\/strong\u003e) platform, these direct-fit sensors incorporate fast-acting integrated ceramic heaters to achieve operating temperature rapidly, minimizing cold-start open-loop emissions. Laser-welded stainless steel housings isolate internal components from road splash, corrosion, and extreme exhaust heat. Factory-calibrated wiring harnesses and correct keyway weather-pack connectors eliminate wire splicing, maintaining precise electrical resistance between the sensor and engine harness.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2 Upstream Oxygen Sensors (Pre-Catalytic Converter)\u003c\/li\u003e\n  \u003cli\u003e2 Downstream Oxygen Sensors (Post-Catalytic Converter)\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: solid font-size: min-width:\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\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;\"\u003e6.0L Vortec 6000 (LQ4\/LQ9) \/ GMT800\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 \/ 365-385 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;\"\u003e213-4669, 234-4407, 213-1161, 213-4229, 234-4669, 6S694, 4S074\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\u003e2003-2006 GMC Yukon 6.0L V8\u003c\/li\u003e\n  \u003cli\u003e2003-2006 GMC Yukon Denali 6.0L V8\u003c\/li\u003e\n  \u003cli\u003e2003-2006 GMC Yukon XL 1500 \/ 2500 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 equipped with the \u003cstrong\u003eVortec 6000\u003c\/strong\u003e 6.0L engine. Verify your vehicle's specific connector styles and harness lengths before installation.\u003c\/p\u003e\n\n\u003ch4\u003eDo I need special tools or anti-seize for installation?\u003c\/h4\u003e\n\u003cp\u003eUse a designated slotted 7\/8-inch (22mm) oxygen sensor socket for removal and installation, and apply high-temperature anti-seize exclusively to the thread body while keeping the sensing tip uncontaminated.\u003c\/p\u003e\n\n\u003ch3\u003eThe GMC Truck Standard\u003c\/h3\u003e\n\u003cp\u003eHeavy-duty towing and hauling demand exact air-fuel ratio management under sustained thermal load. Installing a complete 4-sensor set restores factory stoichiometry, shields expensive catalytic converters from fuel wash, and preserves maximum pulling torque.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67909990842616,"sku":"DS-EH3PQWM55","price":96.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-15464653947128-main-clean.jpg?v=1793395766","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-gmc-yukon-2003-2006-6-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}