{"product_id":"o2-oxygen-sensor-upstream-downstream-for-toyota-sequoia-2001-2004-4-7l","title":"O2 Oxygen Sensor Upstream Downstream for Toyota Sequoia (2001-2004) 4.7L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Upstream and Downstream Oxygen Sensor Kit for 2001-2004 Toyota Sequoia (UCK35\/UCK45)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The complete 4-piece O2 oxygen sensor kit replaces degraded factory sensors on the 2001-2004 Toyota Sequoia to restore closed-loop fuel trim management and eliminate diagnostic trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Toyota Sequoia Sensor Degradation Problem\u003c\/h3\u003e\n\u003cp\u003eOver extended heat cycles and high mileage, factory zirconium dioxide oxygen sensors on the \u003cstrong\u003eToyota Sequoia UCK35\/UCK45\u003c\/strong\u003e suffer from thermal fatigue, silica poisoning, and carbon encrustation. Exhaust gas soot coats the porous ceramic thimble, severely lagging response times between stoichiometric lean and rich transitions. This sensor sluggishness forces the \u003cstrong\u003e2UZ-FE\u003c\/strong\u003e engine control module (ECM) into conservative open-loop or rich-bias operation, causing elevated fuel consumption, catalytic converter overheating, and persistent P0135, P0141, P0171, or P0420 fault codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive upstream and downstream replacement kit utilizes premium planar zirconia sensing elements with fast-acting integrated ceramic heaters to achieve rapid operating temperature activation. Built with dual-laser-welded stainless steel sub-assemblies and PTFE-shielded harness leads, these direct-fit sensors resist moisture intrusion and thermal degradation from radiant exhaust header heat. Calibrated output voltages accurately communicate real-time lambda readings to the ECM, stabilizing short-term and long-term fuel trims (STFT\/LTFT) while protecting emissions equipment. Direct-fit pre-wired weatherproof connectors match OEM pinouts, eliminating the need for wire splicing or custom pinning.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2X 234-4169 Upstream Oxygen Sensors\u003c\/li\u003e\n  \u003cli\u003e2X 234-4161 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;\"\u003e2001-2004 Toyota Sequoia\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\u003e2UZ-FE\u003c\/strong\u003e 4.7L V8 \/ \u003cstrong\u003eUCK35 \/ UCK45\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;\"\u003e240 hp \/ 315 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;\"\u003e\n\u003cstrong\u003eS4-4161\u003c\/strong\u003e, \u003cstrong\u003e234-4169\u003c\/strong\u003e, \u003cstrong\u003e2344161\u003c\/strong\u003e, \u003cstrong\u003e2344169\u003c\/strong\u003e, \u003cstrong\u003e13441\u003c\/strong\u003e, \u003cstrong\u003e2131443\u003c\/strong\u003e, \u003cstrong\u003e5S4203\u003c\/strong\u003e, \u003cstrong\u003e894650C140\u003c\/strong\u003e, \u003cstrong\u003e894650C150\u003c\/strong\u003e, \u003cstrong\u003e8946534080\u003c\/strong\u003e, \u003cstrong\u003e8946534110\u003c\/strong\u003e, \u003cstrong\u003e8946534120\u003c\/strong\u003e, \u003cstrong\u003e8946534130\u003c\/strong\u003e, \u003cstrong\u003e13051\u003c\/strong\u003e, \u003cstrong\u003e13095\u003c\/strong\u003e, \u003cstrong\u003e2131434\u003c\/strong\u003e, \u003cstrong\u003e2131435\u003c\/strong\u003e, \u003cstrong\u003e2131495\u003c\/strong\u003e, \u003cstrong\u003e24554\u003c\/strong\u003e, \u003cstrong\u003e8946509100\u003c\/strong\u003e, \u003cstrong\u003e8946509130\u003c\/strong\u003e, \u003cstrong\u003e8946509150\u003c\/strong\u003e, \u003cstrong\u003e8946509380\u003c\/strong\u003e, \u003cstrong\u003e8946539895\u003c\/strong\u003e\n\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\u003e2001 Toyota Sequoia SR5 \/ Limited 4.7L V8 (2WD \/ 4WD)\u003c\/li\u003e\n  \u003cli\u003e2002 Toyota Sequoia SR5 \/ Limited 4.7L V8 (2WD \/ 4WD)\u003c\/li\u003e\n  \u003cli\u003e2003 Toyota Sequoia SR5 \/ Limited 4.7L V8 (2WD \/ 4WD)\u003c\/li\u003e\n  \u003cli\u003e2004 Toyota Sequoia SR5 \/ Limited 4.7L V8 (2WD \/ 4WD)\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 UCK35\/UCK45 Sequoia?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2001-2004 Toyota Sequoia equipped with the \u003cstrong\u003e2UZ-FE\u003c\/strong\u003e 4.7L engine. \u003cstrong\u003eConfirm your vehicle has the 4.7L V8 naturally aspirated engine prior to purchase, as this kit does not fit 2005+ VVTi engine configurations or V6 models.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eDo these sensors require wire cutting or splicing during installation?\u003c\/h4\u003e\n\u003cp\u003eNo, these direct-fit sensors come pre-terminated with factory-style OE harness connectors and wire lengths for straightforward bolt-on replacement.\u003c\/p\u003e\n\n\u003ch3\u003eThe Toyota Truck Caliber\u003c\/h3\u003e\n\u003cp\u003eEngineered to endure the rigorous thermal demands of heavy towing, hauling, and off-road trail conditions, these oxygen sensors restore factory combustion precision and long-haul reliability to your Toyota truck platform.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67551490965752,"sku":"DS-EECV01N88","price":82.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-toyota-sequoia-2001-2004-4-7l-1.jpg?v=1790797303","url":"https:\/\/performancechiptuning.com\/de\/products\/o2-oxygen-sensor-upstream-downstream-for-toyota-sequoia-2001-2004-4-7l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}