{"product_id":"oxygen-sensors-for-toyota-sienna-1998-2000-3-0l-upstream-downstream","title":"Oxygen Sensors for Toyota Sienna (1998-2000) 3.0L Upstream \u0026 Downstream","description":"\u003ch2\u003eDirect-Fit Upstream \u0026amp; Downstream Oxygen Sensor Kit for 1998-2000 Toyota Sienna\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Oxygen Sensor Kit replaces degraded factory heated exhaust gas sensors on the 1998-2000 Sienna to restore closed-loop air-fuel metering, eliminate P0130-P0161 trouble codes, and stabilize idle quality.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Toyota Sienna Sensor Contamination \u0026amp; Thermal Fatigue\u003c\/h3\u003e\n\u003cp\u003eFactory zirconia O2 sensors on the first-generation \u003cstrong\u003eXL10\u003c\/strong\u003e platform face extreme thermal cycling within the transverse exhaust manifolds. Over decades of operation, the internal ceramic electrolyte thins while combustion byproducts, silica, and unburnt hydrocarbons poison the porous platinum electrodes. On the \u003cstrong\u003e1MZ-FE\u003c\/strong\u003e V6, this degradation results in sluggish millivolt output switching, causing the engine control module (ECM) to run unnecessarily rich default fuel trims. The consequences are fouled spark plugs, premature catalytic converter heat distress, rough warm idle, and failed tailpipe emissions tests.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered to match factory response curves, this 2-piece sensor kit features high-grade planar ceramic sensing elements wrapped in double-layered 304 stainless steel protective heat shields. Laser-welded leak-tight bodies prevent ambient moisture ingress, while pre-treated high-temperature wiring harnesses and factory-keyed pin connectors resist terminal fretting and exhaust radiated heat. Integrated ceramic heating circuits ensure rapid warm-up to reach 600°F operating temperature within seconds, providing instantaneous closed-loop feedback, crisp stoichiometric transitions, and reduced emissions.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\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;\"\u003e1998-2000 Toyota Sienna\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\u003e1MZ-FE\u003c\/strong\u003e (3.0L V6) \/ \u003cstrong\u003eXL10\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;\"\u003e194 hp \/ 209 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;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1998 Toyota Sienna CE, LE, XLE (3.0L V6 \u003cstrong\u003e1MZ-FE\u003c\/strong\u003e)\u003c\/li\u003e\n  \u003cli\u003e1999 Toyota Sienna CE, LE, XLE (3.0L V6 \u003cstrong\u003e1MZ-FE\u003c\/strong\u003e)\u003c\/li\u003e\n  \u003cli\u003e2000 Toyota Sienna CE, LE, XLE (3.0L V6 \u003cstrong\u003e1MZ-FE\u003c\/strong\u003e)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the XL10 Sienna?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 1998-2000 Toyota Sienna equipped with the \u003cstrong\u003e1MZ-FE\u003c\/strong\u003e engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo these sensors require thread anti-seize prior to installation?\u003c\/strong\u003e\u003cbr\u003e Apply a sparse coating of high-temperature conductive anti-seize to threads only if un-plated, keeping compound completely clear of the sensor tip openings.\u003c\/p\u003e\n\n\u003ch3\u003eThe Toyota Longevity Standard\u003c\/h3\u003e\n\u003cp\u003ePreserve Japanese family-van dependability and highway fuel efficiency by maintaining strict air-fuel feedback integrity across every mile of heavy suburban hauling.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50511213003000,"sku":"DS-EU6GISXB2","price":79.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/oxygen-sensors-for-toyota-sienna-1998-2000-3-0l-upstream-downstream-1.jpg?v=1789411366","url":"https:\/\/performancechiptuning.com\/es\/products\/oxygen-sensors-for-toyota-sienna-1998-2000-3-0l-upstream-downstream","provider":"Performance Chip Tuning","version":"1.0","type":"link"}