{"product_id":"o2-oxygen-sensor-downstream-for-ford-explorer-taurus-flex-2013-2015-3-5l","title":"O2 Oxygen Sensor Downstream for Ford Explorer Taurus Flex (2013-2015) 3.5L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Downstream O2 Sensor Set for 2013-2015 Ford Explorer, Taurus, and Flex (D3\/D4 \/ U502)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Downstream Oxygen Sensor Kit monitors post-catalytic converter exhaust gas chemistry on 2013-2015 Ford Explorer, Taurus, and Flex models to maintain factory OBD-II emissions compliance and clear catalyst efficiency fault codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Ford Sensor Contamination and Degradation\u003c\/h3\u003e\n\u003cp\u003eAfter extensive heat cycles and mileage on the \u003cstrong\u003eCyclone 3.5L V6\u003c\/strong\u003e, factory downstream oxygen sensors succumb to exhaust silica contamination, carbon buildup, and internal zirconia element failure. When the OEM ceramic sensing core degrades, signal response slows, causing sluggish voltage output that triggers nuisance diagnostic trouble codes (such as \u003cstrong\u003eP0420\u003c\/strong\u003e, \u003cstrong\u003eP0430\u003c\/strong\u003e, or \u003cstrong\u003eP0136\u003c\/strong\u003e). Weakened internal heater circuits also delay closed-loop readiness, skewing secondary fuel trim corrections and failing annual emissions inspections.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis 2-piece downstream sensor set restores precise millivolt feedback to the engine control unit via robust double-wall stainless steel protective housings and rapid-response internal planar heating elements. Built with high-temperature lead wire shielding and OE-spec weather-pack pin connections, these direct-fit sensors drop directly into the post-catalyst bungs. They reliably replace failing OEM units referenced under \u003cstrong\u003eBE5Z-9G444-A\u003c\/strong\u003e and \u003cstrong\u003e234-4490\u003c\/strong\u003e, ensuring instantaneous data transfer and factory-correct catalyst efficiency monitoring without wire splicing.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2x Direct-Fit 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: 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;\"\u003e2013-2015 Ford Explorer, Taurus, Flex\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 V6 \/ D3, D4, 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;\"\u003e288-290 hp \/ 254-255 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;\"\u003eBE5Z-9G444-A, BE5Z-9G444-B, BE5Z-9G444-C, 234-4490, BA5Z-9G444-A, BA5Z9G444A, BH6Z-9G444-A, BH6Z9G444A, BR3Z-9G444-A, BR3Z9G444A, 2344490\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\u003e2013-2015 Ford Explorer 3.5L V6\u003c\/li\u003e\n  \u003cli\u003e2013-2015 Ford Taurus 3.5L V6\u003c\/li\u003e\n  \u003cli\u003e2013-2015 Ford Flex 3.5L V6\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, D4, and D3 Explorer, Taurus, and Flex?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2013-2015 Ford Explorer, Taurus, and Flex equipped with the \u003cstrong\u003e3.5L Cyclone V6\u003c\/strong\u003e engine in downstream (post-catalytic converter) positions only.\u003c\/p\u003e\n\n\u003ch4\u003eAre these sensors pre-threaded with anti-seize lubricant?\u003c\/h4\u003e\n\u003cp\u003eThreads feature factory-applied anti-seize compound or high-temp coating to prevent thread galling during exhaust bung installation.\u003c\/p\u003e\n\n\u003ch3\u003eThe Ford Durability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to handle severe thermal loads and daily commuter duty cycles, these direct-replacement sensors ensure long-term harness integrity and reliable PCM feedback across heavy hauling, towing, and extended highway transit.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67551445319928,"sku":"DS-EX44SIM36","price":59.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-downstream-for-ford-explorer-taurus-flex-2013-2015-3-5l-1.jpg?v=1790796436","url":"https:\/\/performancechiptuning.com\/fr\/products\/o2-oxygen-sensor-downstream-for-ford-explorer-taurus-flex-2013-2015-3-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}