{"product_id":"o2-oxygen-sensor-upstream-downstream-for-ford-explorer-2011-2012-3-5l","title":"O2 Oxygen Sensor Upstream Downstream for Ford Explorer (2011-2012) 3.5L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit 4-Piece Oxygen Sensor Kit for 2011-2012 Ford Explorer (U502)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The 4-piece oxygen sensor kit replaces degraded upstream and downstream exhaust sensors on the 2011-2012 Ford Explorer to restore precise stoichiometric fuel management and resolve diagnostic trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Ford Explorer Exhaust Sensor Degradation\u003c\/h3\u003e\n\u003cp\u003eOver thousands of thermal cycles, the factory oxygen sensors on the \u003cstrong\u003eU502\u003c\/strong\u003e Explorer platform suffer from sensor tip contamination due to carbon soot, unburned fuel hydrocarbons, and thermal fatigue. As the internal zirconia sensing elements age, their voltage switching latency increases, corrupting the closed-loop feedback loop sent to the powertrain control module. This delayed response forces inaccurate long-term fuel trim corrections, causing increased fuel consumption, degraded throttle response, rough idling, and catalytic converter overheating. Replacing only one failed sensor typically leaves remaining aging units out of sync, leading to recurrent check engine lights.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive 4-sensor replacement set engineered for the \u003cstrong\u003e3.5L Cyclone Ti-VCT\u003c\/strong\u003e V6 replaces both Bank 1 and Bank 2 upstream wideband\/air-fuel ratio sensors and downstream catalytic efficiency monitors simultaneously. Built with robust ceramic planar elements and laser-welded dual protective stainless steel outer bodies, these sensors resist contamination and thermal shock. Integrated rapid-heating ceramic elements drastically reduce cold-start light-off times to establish rapid closed-loop metering. Factory-pinned terminal connectors, OE-length heat-shielded harness wire, and pre-threaded anti-seize coating ensure true direct-fit installation without wire splicing or signal resistance issues.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2PCS Upstream Oxygen Sensor\u003c\/li\u003e\n  \u003cli\u003e2PCS Downstream Oxygen Sensor\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;\"\u003e2011-2012 Ford Explorer\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;\"\u003e3.5L Cyclone Ti-VCT V6 \/ U502\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;\"\u003e290 hp \/ 255 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;\"\u003e234-4489, 234-5038, BR3Z-9G444-A, BR3Z9G444A, BE5Z9G444D, BH6Z9G444A, BL3Z9F472A, BL3Z9G472A, CA38188G1, CA3918861, CA4118861, CK4Z9G444D, DY1178, OS5578, ZZDL18861, 234-4490, 9E5Z9F472D, 2344489\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\u003e2011 Ford Explorer 3.5L V6 (Base, XLT, Limited)\u003c\/li\u003e\n  \u003cli\u003e2012 Ford Explorer 3.5L V6 (Base, XLT, Limited)\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 U502 Explorer?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2011-2012 Ford Explorer equipped with the \u003cstrong\u003e3.5L Cyclone Ti-VCT\u003c\/strong\u003e naturally aspirated V6; it does not fit 2.0L EcoBoost turbo models.\u003c\/p\u003e\n\n\u003ch4\u003eWhy should I replace all four O2 sensors at the same time?\u003c\/h4\u003e\n\u003cp\u003eReplacing upstream and downstream sensors as a matched set prevents sensor response disparities across both cylinder banks, guaranteeing balanced closed-loop fuel trims and extended catalytic converter life.\u003c\/p\u003e\n\n\u003ch3\u003eThe Ford Utility Durability Standard\u003c\/h3\u003e\n\u003cp\u003eEnsure reliable towing capability, optimal highway mileage, and dependable performance on your \u003cstrong\u003eU502\u003c\/strong\u003e chassis by keeping combustion feedback circuits clean and accurate under all operating loads.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67551454822648,"sku":"DS-E0SDG7P24","price":99.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-ford-explorer-2011-2012-3-5l-1.jpg?v=1790796583","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-ford-explorer-2011-2012-3-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}