{"product_id":"o2-oxygen-sensor-upstream-downstream-for-toyota-tundra-2003-2004-4-7l","title":"O2 Oxygen Sensor Upstream Downstream for Toyota Tundra (2003-2004) 4.7L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Oxygen Sensor Kit for 2003-2004 Toyota Tundra (UCK30 \/ UCK40)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The 4-piece O2 Oxygen Sensor Kit replaces degraded factory upstream and downstream sensors on the 2003-2004 Toyota Tundra to restore precise air-fuel ratio management and eliminate check engine lights.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Toyota Tundra Sensor Degradation\u003c\/h3\u003e\n\u003cp\u003eFactory zirconia elements on the first-generation \u003cstrong\u003eUCK30 \/ UCK40\u003c\/strong\u003e exhaust system suffer from thermal fatigue, silica contamination, and carbon fouling after extended heat cycles. Over time, internal heater circuit resistance rises, causing sluggish voltage switching between stoichiometric rich and lean thresholds. This delayed signal loop forces the ECU to dump excess fuel, resulting in unburnt hydrocarbons, catalytic converter deterioration, reduced MPG, and recurring P0135\/P0155 trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered to exact OEM operational tolerances for the \u003cstrong\u003e2UZ-FE\u003c\/strong\u003e engine, these direct-fit sensors utilize heavy-duty planar ceramic sensing cores shielded by dual laser-welded stainless steel protective sleeves. High-temp internal heater circuits achieve rapid operating light-off to enter closed-loop ECU fuel control immediately, safeguarding catalytic bed efficiency and maximizing combustion stability under heavy trail or towing loads.\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: 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;\"\u003e2003-2004 Toyota Tundra\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 \/ \u003cstrong\u003eUCK30 \/ UCK40\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;\"\u003e245 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;\"\u003eS4-4161, 234-4169, 2344161, 2344169, 13441, 2131443, 5S4203, 894650C140, 894650C150, 8946534080, 8946534110, 8946534120, 8946534130, 13051, 13095, 2131434, 2131435, 2131495, 24554, 8946509100, 8946509130, 8946509150, 8946509380, 8946539895\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\u003e2003-2004 Toyota Tundra 4.7L V8 (Base, SR5, Limited; 2WD \u0026amp; 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 UCK30 \/ UCK40 Tundra?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2003-2004 Toyota Tundra equipped with the \u003cstrong\u003e2UZ-FE\u003c\/strong\u003e 4.7L V8 engine; verify your engine displacement as this kit does not fit 3.4L V6 models.\u003c\/p\u003e\n\n\u003ch4\u003eAre wire splicing or harness modifications required for installation?\u003c\/h4\u003e\n\u003cp\u003eNo, these sensors feature factory-matched harnesses and locking connectors for direct plug-and-play installation without wire splicing.\u003c\/p\u003e\n\n\u003ch3\u003eThe Toyota Caliber\u003c\/h3\u003e\n\u003cp\u003eBuilt to handle harsh underbody heat and continuous payload duty cycles, these direct-fit sensors maintain steady fuel trim feedback to keep your Tundra running strong across high-mileage highway miles and heavy hauling conditions.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67551491522808,"sku":"DS-EJRINRDMB","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-tundra-2003-2004-4-7l-1.jpg?v=1790797332","url":"https:\/\/performancechiptuning.com\/es\/products\/o2-oxygen-sensor-upstream-downstream-for-toyota-tundra-2003-2004-4-7l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}